These were easy to set up under my Winnebago Revel. I set them up myself and drove straight on top with no issues. The terrain in Big Bear was gravely, but these did not crack at all. I will likely get another set because I could have gone a little higher, but still made a big difference in the level of my van. They had settled into the dirt a bit when I was packing up to leave, but nothing I noticed being inside. The carrying case keeps them nice and compact. Overall I would say a sturdy product!
Rating: [5 of 5 Stars!]