Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: Measurments / dimentions of the unit and minimum width of ladder leg suitable for.
Document: SOME ladders may be too wide and these attachments will not work anyway since they add ladder width and thus will put each leg on 1st and 4th step instead of in my case 1st and 3rd step which is 7-1/2 + 7-1/2 = 15 inches. What I did was to place them at lowest position possible to be more than 1-1/2&#34; from bottom.
Extending the ladder isn't possible with the Werner series levelers.This leveler is not designed for use with a multi-ladder like Little Giant, Vulcan, or Werner MT series, but it does work well when installed on one. Note that the base of the multi-ladder at the leveler is spread by up to a foot, so only use if the extra width is ok.Updated some of the wording above a month after making original entry.
Use this for steep terrain. No longer have to haul bricks / lumber along to shim the ladder feet level. Very sturdy and adjusting the legs is very fast and easy. One thing to keep in mind is that it effectively spreads the width of the ladder at the base. This makes for a more stable platform, but also makes the height adjustment not enough in some situations (e.g. on steps, since you have to span two steps instead of one).
I just received this product and installed it on my 20 ft. aluminum extension ladder. As noted in many other reviews it was easy to install, is very rugged and with the big 4 in. padded swivel feet provides very stable footing even better than the original ladder due to the added width of stance and added weight at the bottom of the ladder. I immediately ordered a second set to install on my 32 ft. ladder.
Since it is difficult (practically impossible) to precisely locate the holes by drilling on a mark, especially in metal,  I used this procedure: 1) Position the leveler in the proper location (following the directions) and clamp the leveler in the correct position. Be sure there is clearance between the locking mechanism and the flanges of the ladder rails. If the distance between the flanges is more than 2 inches, Use a shim that is 1/2 the difference between the leveler mounting width and the flange width.
I bought a set of these in order to use my extension ladder on a stairway (my aluminum extension ladder is also a Louisville). Come to find out, if you install both extensions, the extra width created by the extensions on the sides of the ladder makes the ladder too wide to fit on standard stairs (to get both legs of the ladder firmly on the treads of the stairs). I had to remove one in order to make it work. The product works good as far as the mechanics.
One problem arose when I went to remove the screws on the unit to allow for installation. They stripped quite easily...well the one did. I then figured out a workaround to not have to remove the plate so I could figure out the hole placement on the ladder. But again, the units once installed work great.
After looking at several options, I decided to go with this particular product due to the reasonable price and the positive reviews. I attached the levelers in under an hour. They mount quite easily with 4 bolts, washers, and lock nuts. As with the other products, you have to remove the original ladder feet. The drilling is made easier with a quick-clamp bar clamp or something similar to hold the unit in place while drilling the mounting holes.
It was easy to install and it is fairly easy to adjust the balance. It allowed me to use my tall ladder on our sloping mulch bed without trying to use bricks or pieces of wood to balance a ladder leg!
I have used many different ladder leveler's before, these are the absolute best and easiest ever used. They come as a set 4 bolts to mount each side makes a very sturdy leg, the footpads stay flat in all directions.
Answer: yes