Ooops. I guess trikes don't go through sand. I had a hard time pedaling through it last time, so I thought I'd try a different technique. So much for my idea. I ate a mouthful speeding through 7 feet of sand over pavement as I sped by at 17mph. It was probably only 2.5" at its deepest point but at least I made it through.
5 minutes later, I can still feel the grains of sand in my teeth.