Anderson Camper Levelers, anyone use them, do you like them?

Be careful with boards that are longer than the ground clearance of the trailer. When driving off, and the end is not supported, it can tip up and catch the underside causing you to be stuck like a post turtle. Yes, I have seen it happen. Likewise, with the Andersen plastic thing, I wonder if smaller trailers might be low enough to cause the same problem.