I just installed a set on my landing gear this weekend. Took me longer to measure than to actually install them....VERY simple install
From a very basic "push test" they have locked the front of the 5er in place, but I think I will add a set to the rear. I will have to re-position my back stab jacks to make it work, and that is half the reason i got them....just to see if they would work on the rear jacks. I think with a little imagination I can get them to work. We will be camping this weekend so that will be a good test, will also know for sure if they are needed on the back.
I was going the "build my own" route, until I saw that Amazon had a set that was "used". I took a gamble (the price was right) and ordered them. Since they were being sold used by Amazon I was able to get my Prime benefits and had them in 2 days. I got the box and it had been opened, but the bag the mounting hardware was in had not. It looks like someone bought it, opened it, and returned it without installing it.