Camco is a great friend to rvers everywhere - they are all about rv products and accessories. So it is no surprise that they have their own set of 10 leveler blocks. They are bright yellow, so darn easy to find, and stack together in their own carrying case.
They are approximately ten dollars cheaper than the competing brand. Though any trailer levelers can crack with too much weight on top of them, the reviews seem to reflect that it might happen more often with these...but if you have a lighter recreational vehicle, I wouldn't think it would be a problem...and Amazon has an awesome A to Z guarantee, so try them out soon after you get them, so you can return in the event you are disappointed.
Once again, Camco is a very trusted name so they are certainly worth considering!