Having had back surgery and seeing what I'm doing is great. Being able to get them in between the tires and step on them to install them is a lot easier than installing chokes. Then when I'm ready to move the camper I can't say enough about the cable. Now I don't have to lean as far to clear the blocks. I park our RV on Rock 57 and although they are recommended to be used on hard ground they work on gravel. I hitched myself to an RV and one of those houses was between the wheels and when I pulled the truck out the wedge stopped the van from rolling. I step back to release the pressure, then remove them. I have to adjust them when going from parking on rock 57 to hard flat ground, but it only takes a few seconds. Being able to block them is a great option. I haven't done this as my back can just about bend far enough to lock and unlock the lock, but I'll try. I liked one so much I bought another to lock the wheels on the other side. Judging by the weather they are already 3 months old and they are still like new.