These work great, but you do need to make sure you have enough space between the wheels for them. On my Heartland Big Horn, they barely fit between the wheels when fully collapsed. Still usable, but you really have to jam them in.
I live in a travel trailer year round. These are one of the best purchases I have made for my trailer. They are simple and easy to install and remove, and make a TOTAL difference with stability and movement in the trailer. There is still some obvious rocking but it has absolutely lessened. Plus, you can throw a lock on them for added security.
Took them out of the box and it was easy toinstall. The stability of our camper is amazing now. Still has some movement but nowhere near what it was before installing.