Document:

<PAGE>   1
                                                                   EXHIBIT 10.15
INTER
OFFICE
MEMO

                                                     DATE:  December 6, 1999

TO:               Mr. Keith Hull

FROM:             Sharon L. Rodgers

         I am pleased to inform you that you have been approved to participate
in the management incentive plan for fiscal 2000. You will participate in the
plan based on an individual percentage award of 65%.

         For fiscal 2000, 100% of your actual incentive award will be based on
achievement of Financial Goals, as set forth below.

                                 Financial Goals

         The Financial Goals for your fiscal 2000 award are as follows:

<TABLE>
<CAPTION>
                                                           Corporate
                                                       Operating Earnings
                        Performance                  (Thousands of Dollars)
                           Level                            (EBITDAL)
                     -----------------             --------------------------
                     <S>                           <C>
                           25%                               $85,000
                           50%                                90,000
                           75%                                95,000
                          100%                               100,000
</TABLE>

         100% of your actual incentive award will be based on achievement of
Financial Goals. Your actual incentive award will be determined by multiplying
your total base salary paid in fiscal 2000 times your individual percentage
award times the Performance Level achieved as set forth above and will be
calculated by the Company. Any such award will be prorated when the Performance
Level achieved falls between the 25% and 100% levels. No incentive award will be
paid if the Performance Level is below 25%,

<PAGE>   2

and no additional incentive award will be paid for any financial results which
exceed the 100% Performance Level.

         The general guidelines of the plan for fiscal 2000 are as follows:

         1.       Operating earnings (EBITDAL) will be defined as reported in
                  the Company's financial statements (Red Stripe).

         2.       Your actual incentive award will be paid on an annual basis,
                  with payment to be made as soon as practical after the fiscal
                  year audit is completed.

         3.       No incentive award will be paid if you are not in the employ
                  of the Company on the last day of the fiscal year (effective
                  date of severance must be after fiscal year end).

         4.       In the event you are reassigned or given a new position and
                  responsibilities during the fiscal year (promotion or
                  demotion), payment of the incentive award will be determined
                  on a case-by-case basis. The Company reserves the right to
                  deny payment or to reduce the incentive award in the case of
                  demotions.

         Please indicate your understanding of the plan, the performance goals
and your potential incentive award by signing and returning this letter to me. A
copy is provided for your personal files.

                                                      \s\  Sharon L. Rodgers
                                                      --------------------------

Acknowledged: \s\  Keith M. Hull
              ----------------------

Date:         December 6, 1999
              ----------------------<PAGE>   1

                                                                   EXHIBIT 10.16
INTER
OFFICE
MEMO

                                                     DATE:  December 6, 1999

TO:               Mr. Craig Crockard

FROM:             Sharon L. Rodgers

         I am pleased to inform you that you have been approved to participate
in the management incentive plan for fiscal 2000. You will participate in the
plan based on an individual percentage award of 40%.

         For fiscal 2000, 100% of your actual incentive award will be based on
achievement of Financial Goals, as set forth below.

                                 Financial Goals

         The Financial Goals for your fiscal 2000 award are as follows:

<TABLE>
<CAPTION>
                                                         Corporate
                                                    Operating Earnings
                         Performance               (Thousands of Dollars)
                            Level                        (EBITDAL)
                      -----------------         --------------------------
                      <S>                       <C>
                            25%                          $85,000
                            50%                           90,000
                            75%                           95,000
                           100%                          100,000
</TABLE>

         100% of your actual incentive award will be based on achievement of
Financial Goals. Your actual incentive award will be determined by multiplying
your total base salary paid in fiscal 2000 times your individual percentage
award times the Performance Level achieved as set forth above and will be
calculated by the Company. Any such award will be prorated when the Performance
Level achieved falls between the 25% and 100% levels. No incentive award will be
paid if the Performance Level is below 25%,

<PAGE>   2

and no additional incentive award will be paid for any financial results which
exceed the 100% Performance Level.

         The general guidelines of the plan for fiscal 2000 are as follows:

         1.       Operating earnings (EBITDAL) will be defined as reported in
                  the Company's financial statements (Red Stripe).

         2.       Your actual incentive award will be paid on an annual basis,
                  with payment to be made as soon as practical after the fiscal
                  year audit is completed.

         3.       No incentive award will be paid if you are not in the employ
                  of the Company on the last day of the fiscal year (effective
                  date of severance must be after fiscal year end).

         4.       In the event you are reassigned or given a new position and
                  responsibilities during the fiscal year (promotion or
                  demotion), payment of the incentive award will be determined
                  on a case-by-case basis. The Company reserves the right to
                  deny payment or to reduce the incentive award in the case of
                  demotions.

         Please indicate your understanding of the plan, the performance goals
and your potential incentive award by signing and returning this letter to me. A
copy is provided for your personal files.

                                                      \s\  Sharon L. Rodgers
                                                      -------------------------

SLR/kjw

Acknowledged: \s\ Craig Crockard
              ------------------------------

Date:         December 14, 1999
              ------------------------------<PAGE>   1

                                                                     EXHIBIT 4.1

NEITHER THIS WARRANT NOR THE SECURITIES ISSUABLE UPON EXERCISE HEREOF HAVE BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY APPLICABLE STATE
SECURITIES LAW AND NEITHER MAY BE SOLD OR OTHERWISE TRANSFERRED UNTIL (i) A
REGISTRATION STATEMENT UNDER SUCH SECURITIES ACT AND SUCH APPLICABLE STATE
SECURITIES LAWS SHALL HAVE BECOME EFFECTIVE WITH REGARD THERETO, OR (ii) THE
COMPANY SHALL HAVE RECEIVED A WRITTEN OPINION OF COUNSEL ACCEPTABLE TO THE
COMPANY TO THE EFFECT THAT REGISTRATION UNDER SUCH SECURITIES ACT AND SUCH
APPLICABLE STATE SECURITIES LAWS IS NOT REQUIRED IN CONNECTION WITH SUCH
PROPOSED TRANSFER.

                             BLUE RHINO CORPORATION
                        WARRANT TO PURCHASE COMMON STOCK

                                October 26, 2000

         FOR VALUE RECEIVED, Thomas E. Brandtonies (together with any subsequent
registered holder or holders hereof, the "Holder") is entitled to subscribe for
and purchase from BLUE RHINO CORPORATION, a Delaware corporation (the
"Company"), 100,000 shares (the "Shares") of the Company's common stock, $0.001
par value per share ("Common Stock"), in accordance with the terms of this
Warrant to Purchase Common Stock (this "Warrant") as hereinafter set forth. All
Shares issued upon the exercise of this Warrant will, upon issuance and full
payment therefor, be fully paid and nonassessable and free from all taxes, liens
and charges with respect thereto (other than those (i) which the Company shall
promptly pay or discharge, (ii) created by the Holder or (iii) based on the
Holder's income or revenues).

         This Warrant is subject to the following terms and conditions:

         1. Term of Warrant. This Warrant shall be exercisable, in whole or in
part, during the period commencing on the date hereof and ending at 5:00 p.m.
Winston-Salem Time on October 25, 2005 (the "Expiration Date"). Any unexercised
portion of this Warrant shall terminate and become unexercisable as of the
Expiration Date.

         2. Exercise Price. The price per Share at which this Warrant may be
exercised shall be $6.00 (the "Warrant Price"). Upon delivery of this Warrant
together with the payment of the Warrant Price for the Shares to be purchased,
at the principal office of the Company, the Holder shall be deemed to have
exercised this Warrant and shall be entitled to be issued the Shares so
purchased. In case of any partial exercise of this Warrant, the Company shall
execute and deliver a new Warrant of like form, tenor and date for the balance
of the Shares.

<PAGE>   2

         3. Adjustment of Warrant Price and Number of Shares. The Warrant Price
and the number of Shares purchasable hereunder shall be subject to adjustment
from time to time in accordance with the following provisions:

                  (a) In case the Company shall at any time subdivide the
outstanding shares of Common Stock, the Warrant Price in effect immediately
prior to such subdivision shall be proportionately decreased, and in case the
Company shall at any time combine the outstanding shares of Common Stock, the
Warrant Price in effect immediately prior to such combination shall be
proportionately increased, effective from and after the record date of such
subdivision or combination, as the case may be. Upon any adjustment in the
Warrant Price per Share pursuant to this Section 3(a), the Holder shall
thereafter be entitled to purchase, at the adjusted Warrant Price, the number of
Shares, calculated to the nearest full Share obtained by (X) multiplying the
number of Shares purchasable hereunder immediately prior to such adjustment by
the Warrant Price in effect immediately prior to such adjustment, and (Y)
dividing the product thereof by the Warrant Price resulting from such
adjustment.

                  (b) In the event of the issuance of additional shares of
Common Stock as a dividend or distribution to the holders of outstanding shares
of Common Stock, from and after the day which is the record date for the
determination of stockholders entitled to such dividend or distribution, the
Holder shall (until another adjustment) be entitled to purchase a number of
Shares equal to (i) the number of Shares purchasable hereunder immediately prior
to said record date multiplied by the percentage which the number of additional
shares of Common Stock constituting any such distribution is of the total number
of shares of Common Stock outstanding immediately prior to said record date plus
the number of shares of Common Stock issuable upon conversion of the outstanding
convertible securities or upon exercise of any outstanding warrants, options or
rights (including those with respect to convertible securities) plus (ii) the
number of Shares purchasable hereunder immediately prior to said record date.
Upon each adjustment pursuant to this Section 3(b), the Warrant Price in effect
immediately prior to such adjustment shall be reduced to an amount determined by
dividing (X) the product obtained by multiplying such Warrant Price by the
number of Shares purchasable hereunder immediately prior to such adjustment by
(Y) the number of Shares purchasable hereunder immediately following such
adjustment.

         4. Reorganization, Reclassification, Consolidation or Merger. If at any
time while this Warrant is outstanding there shall be any reorganization or
reclassification of the shares of Common Stock (other than a subdivision or
combination of shares provided for in Section 3(a)), or any consolidation,
merger or similar transaction of the Company with another corporation, the
Holder shall thereafter be entitled to receive, during the term hereof and upon
payment of the Warrant Price, the number of shares of stock or other securities
or property of the Company or of the successor corporation resulting from such
transaction, as the case may be, to which a holder of the Shares issuable upon
the exercise of this Warrant would have been entitled upon such reorganization,
reclassification, consolidation, merger or similar transaction if this Warrant
had

<PAGE>   3

been exercised immediately prior to such reorganization, reclassification,
consolidation, merger or similar transaction; and in any such case, appropriate
equitable adjustment (as determined by the Board of Directors of the Company)
shall be made in the application of the provisions herein set forth with respect
to the rights and interest thereafter of the Holder to the end that the
provisions set forth herein (including the adjustment of the Warrant Price and
the number of Shares issuable upon exercise of this Warrant) shall thereafter be
applicable, as near as reasonably may be, in relation to any shares or other
property thereafter deliverable upon the exercise hereof.

         5. Notice of Adjustments. Upon any adjustment of the Warrant Price and
any increase or decrease in the number of Shares purchasable upon exercise of
this Warrant, then, and in each such case, the Company, within 30 days after the
Holder's request, shall give written notice thereof to the Holder at its address
as shown on the books of the Company, which notice shall state the Warrant Price
as adjusted and the increased or decreased number of Shares purchasable upon
exercise of this Warrant, setting forth in reasonable detail the method of
calculation of each.

         6. Charges, Taxes and Expenses. The issuance of Shares upon any
exercise of this Warrant shall be made without charge to the Holder for any tax
or other expense in respect to such issuance (other than taxes based on the
Holder's income or revenues), all of which taxes and expenses shall be paid by
the Company, and, subject to Section 7, such Shares shall be issued in the name
of, or in such name or names as may be directed by, the Holder; provided,
however, that in the event that Shares are to be issued in a name other than the
name of the Holder, this Warrant when surrendered for exercise shall be
accompanied by an instrument of transfer in form satisfactory to the Company,
duly executed by the Holder in person or by an attorney duly authorized in
writing, and the Holder shall pay all transfer taxes payable upon issuance of
such Shares, if any.

         7. Compliance with Securities Laws:

                  (i) By its acceptance hereof, the Holder hereby represents
that (a) this Warrant is, and the Shares will be, acquired for investment for
its own account, not as a nominee or agent, and not with a view to the sale or
distribution of any part thereof, (b) it has no present intention of selling,
granting participation in, or otherwise distributing this Warrant or the Shares
and (c) it does not have any contract, undertaking, agreement, or arrangement
with any person to sell, transfer or grant participations to such person, or to
any third person, with respect to the Warrant or the Shares.

                  (ii) The Holder understands that this Warrant and the Shares
have not been registered under the Securities Act of 1933, as amended (the "1933
Act"), on the grounds that the issuance of the Warrant and the Shares are being
made in reliance on an exempt from the registration requirements of the 1933
Act, and that the Company's reliance on such exemption is

<PAGE>   4

predicated in part upon the Holder's representations and warranties set forth
herein. The Holder realizes that the basis for such exemption may not be present
in the event that, notwithstanding such representations and warranties, the
Holder has in mind merely acquiring the Warrant or the Shares for a fixed or
determined period in the future, or for a market rise, or for sale if the market
does not rise. The Holder represents that it does not have any such intentions.

                  (iii) By its acceptance hereof, the Holder represents that it
is an accredited investor, as defined under Regulation D of the 1933 Act, as
amended, experienced in evaluating companies such as the Company, is able to
fend for itself with respect to an investment in the Company, has such knowledge
and experience in financial and business matters as to be capable of evaluating
the merits and risks of its investments, and has the ability to bear the
economic risks of its investments. The Holder further represents that it has had
the opportunity to consult with its own legal counsel with respect hereto and
has had access, prior to the issuance of this Warrant, to all such information
as it deemed necessary or appropriate and that it has had, prior to the issuance
of this Warrant, the opportunity to ask questions of, and receive answers from,
the Company concerning the terms and conditions of this Warrant and the
Company's business, management and financial affairs and to obtain additional
information necessary to verify the accuracy of any information furnished to it
or to which it had access.

                  (iv) The Holder understands that the Warrant and the Shares
may not be sold, transferred or otherwise disposed of without registration under
the 1933 Act or an exemption therefrom, and that in the absence of an effective
registration statement covering the Warrant (or the Shares) or an available
exemption from registration under the 1933 Act, the Warrant and the Shares must
be held indefinitely. In particular, the Holder is aware that the Warrant and
the Shares may not be sold pursuant to Rule 144 promulgated under the 1933 Act
unless all of the conditions of that Rule are met. The Holder represents that,
in the absence of an effective registration statement covering the Warrant or
the Shares, it will sell, transfer or otherwise dispose of the Warrant or the
Shares only in a manner consistent with its representations set forth herein.

                  (v) The Holder agrees that in no event will it make a transfer
or disposition of the Warrant or the Shares other than in compliance with all
applicable laws.

                  (vi) The Holder understands that each certificate or
instrument representing the Warrant or the Shares will be endorsed with
restrictive legends as required by applicable state securities laws and
substantially as follows:

         THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
         REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE
         "1933 ACT"), OR APPLICABLE STATE SECURITIES LAWS. THESE
         SECURITIES HAVE BEEN ACQUIRED FOR INVESTMENT

<PAGE>   5

         AND NOT WITH A VIEW TO DISTRIBUTION OR RESALE, AND MAY NOT BE
         SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR OTHERWISE
         TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION STATEMENT FOR
         SUCH SECURITIES UNDER THE 1933 ACT AND ANY APPLICABLE STATE
         SECURITIES LAWS, OR DELIVERY TO THE ISSUER OF AN OPINION OF
         LEGAL COUNSEL REASONABLY ACCEPTABLE TO IT TO THE EFFECT THAT
         AN EXEMPTION FROM THE REGISTRATION PROVISIONS OF THE 1933 ACT
         AND APPLICABLE STATE SECURITIES LAWS IS AVAILABLE FOR THE
         PROPOSED TRANSACTION.

         8. Miscellaneous.

                  (a) The terms of this Warrant shall be binding upon and shall
inure to the benefit of any successors or assigns of the Company and the Holder
hereof and of the Shares.

                  (b) Except to the extent this Warrant is validly exercised, no
Holder, as such, shall be entitled to vote or receive distributions or be a
stockholder of the Company in respect of the Shares for any purpose.

                           [signature page to follow]

<PAGE>   6

         IN WITNESS WHEREOF, the Company has caused this Warrant to be signed by
its duly authorized officer.

         DATED as of the 26th day of October 2000.

                                          Blue Rhino Corporation

                                          By: /s/ Billy D. Prim
                                                  Billy D. Prim
                                                  Chief Executive Officer

Accepted and agreed:

/s/ Thomas E. Brandtonies
Thomas E. Brandtonies

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