Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: So for any ladder that this is being used on, you're basically drilling into the ladder to install nuts/bolts for the mounts?
Document: I have bought several different ladder levelers, and this is by far the best. The mounts attach fairly easily with a drill and a couple wrenches. Once attached, the leveler easily connects and disconnects with the mounts on either side. This leveler is far easier to adjust than every other model I have used. You can leave it attached to either side and it is out of the way, yet ready to use when you need it. Changes sides in a matter of seconds.
This should be a worthwhile safety feature to add to my 24 ft fiberglass extension ladder. For years I've been using 2X4 blocks, bricks, wood shingles, you name it I've probably used it to  level my ladder on uneven surfaces - you probably have too! Misses Claus left this leveler under the tree: I'm presuming it's to prolong my useful life and/or limbs. Haven't had time to install on ladder yet, but it appears to be a simple enough procedure, after perusing the instructions.
kept putting off buying this for a long time, kept using a brick under the foot of my 28' ladder to clean my gutters on the sloped side of my house as my wife held the ladder calling me a 'nut'. she got this for me and it was very easy to install- drill 3 holes each side, tighten bolts,done-that simple!!! snap the leveler on, push down on bar and its set. you can put the leveler part on either side of ladder.
Very well designed and easy to use. Just so much safer than blocking under the low side of a ladder. Easy on and off for switching sides. Very weather resistant after two years use. If you have multiple ladders, highly recommend getting an extra set of the fixed mounts, so switching ladders is quick and easy.
I lean the ladder against the house and extend the leveler with a foot - the ratcheting mechanism locks it in place. It really is an ingenious device.Even with this device though, if one ladder leg is lower than the other by only an inch or so, I sometimes just use a scrap of wood to bring it level. If it's more than that, this device is allows a ladder to be used safely.
It took a while to attach the base pieces to my ladder (a Werner MT-17); attaching the bases requires drilling holes into the ladder. Once attached, however, this is very easy to use. I use it to work on the outside of a screened-in porch. The ground slopes, so a regular ladder wouldn't work. The extenders are finely adjustable enough to work on sloping ground, and it feels very steady.
easy to install ........ Now I can be safe while on my 40 foot ladder and ready for uneven ground as well
These work great and seem sturdy enough...With a little patience not too tough to install...You will need to drill holes in the ladder...
Pretty simple to install following the directions. Ladder very stable on slanted surfaces, and is even more stable on level ground than previously.
The adjustment takes less than 30 seconds per leg. I have used this setup many times and it adds a lot of stability and safety to my worksite. I go 2 to 3 units high and work with complete confidence.Note that the Baker scaffolding is roughly a half size for full scaffolding being only 30 inches wide, about 6.5 feet high and about 7 feet long.
Answer: yes