These blocks are great. Nice, heavy duty, made from a glass reinforced plastic that is made to take a beating and last for years and years. Perfect size for the pads of my camper and make it a lot easier to set my stabilizers without having to bring out all of the yellow blocks or drop the stabilizers all the way to the ground. I really like how they are easy to pick up with the finger holes near the bottom, otherwise since they are heavier and smooth it would be hard to grab with just one hand. They stack but still take up a bit of space and weight, so you will want to account for that. Is it worth bringing these versus placing a single bock of wood or yellow lego pad to give you a wider stance? I think so and I have a place to keep them so it's worth it to me. These are also a great value, half the price of some of the other blocks that I have looked at. Also a nice plus is that the label on the block is a polyester label that peels right off without leaving any residue behind. That might just be a small thing to me, but I hate the paper stickers that look like junk after you use these things, since they are made to be outside, in the dirt.
Mark C. Hopp Sr. 
