ok. so the rocks are a mix of all of those really, it's just rocks in general, small, skipping, some larger, some more dirt than rocks, but mainly rocks. enough to make it uncomfortable to walk bearfoot over them for sure.  so i think i'll go with a plastic version or metal one, which ever will depend on how badly i want a tank at the time, if i think i can wait longer for the better tank then i will. also, just a quick question on the mato sherman(i think i'll order from matomart, they have the best selection i've seen), will it do good out of the box for a starter tank? i've always liked shermans, so it would be fun to have an rc version. especially since i'm going to make a landing craft, they were the tanks that were actually used in them. i'm pretty sure kv-1's were never used in landing crafts.