Ultra-FabProducts 21-001091 Super Grip Chock (2 Pack)

This product works great. Good price for a pair. Another set I tried didn't extend out far enough to lock my tandem wheels on my 31' camper/travel trailer. This set extends out pretty far. I love the locking mechanism. When I set up my camper I use the locks to ensure another step in securing my camper AND the chocks. Got these because my kids run and play in the camper as if they're at home. These really helped withe rocking and swaying. I did upgrade the locks bc the lock that come with the chocks were a little too wimpy for my pleasure. Note you have to be selective on the size of the upgraded locks bc certain sizes will not fit through the opening for the locks.

I was a bit skeptical at first - saw another person using it but after speaking with them I had to give it a try. I’m quite surprised how well it holds the camper and how much less forward-backward motion we have. I would have not believed if I didn’t try. Super easy to install, use and take off when done. I’m a big fan now and it works really well. I got the pair, they came with a tool to ratchet them into place and there’s even a small cap you can lock in place with a padlock so it can’t be removed.

The chocks are fairly well built, seem sturdy enough; however, you do not want to over tighten as the wrench that accompanies the set is not very well built - and it is not necessary regardless. When installing, it can be a bit of a chore - just make sure to tilt all of the four grippers on each chock such that the full grip will come in contact with the tires and adjust accordingly while tightening. Due to the RV Trailer fairing over the wheels of our trailer, I had to install my chocks upside down which added to the difficulty in installing them. The end result; however, is truly worth the cost and effort. Rocking is reduced by a considerable amount - not eliminated, but enough to make a measurable difference in comfort while walking around inside the RV. Well worth both the cost and effort to install.

I use these x-chocks on my 33 foot travel trailer. I feel more comfortable chocking my wheels with these when I've got one side of my RV several inches up off the ground from the lynx levelers. The product itself seems to be well built. I'm not nervous about tossing them down on the ground when I'm setting up or throwing them into my storage compartments.Ratcheting them down with the included ratchet takes just a few minutes and that it! I believe it has also help stabilized the camper itself by removing some of the bounce out of the wheels. I was so impressed with these, that I purchased a pair for my father to use on his travel trailer. I have and will continue to recommend to others!

Easy to use and work well within the small space between the tires.