We bought Lynx Levelers recently and tried them out on a 12 day trip recently. I was pretty happy with them, but for severe terrain issued, you would need to get pretty elaborate with stacking and need more than one set. We were able to level our truck every time with them, but almost every site was close to level.
First time using them on asphalt with more than one block, they kept skidding along in front of the tire. We always keep 2-4 of those 20" square foam interlocking mats (people use them for home gym floors) on trips. Two of them wedge securely between the front of the camper and the front wall of the truck bed, so they basically take up a small amount of space that can't be used for anything else anyways. We always brought them along to make a door mat at the foot of our steps in case it is muddy. I put one under each stack of leveling blocks; when the truck tire contacts the blocks, it pushes them down into the soft mat and locks them into place.