RC Speed Tank - Alternate Treads

Inspired by evil_k (http://www.thingiverse.com/thing:2227184), I threw together a couple of alternate treads for the RC Speed Tank. I'm still in the process of testing them, so take them with a grain of salt!

All 3 need support.

UPDATE: Added v1.1 and v3.1. The treads are thicker and deeper. After printing and evaluating v1.1, I think 3 treads per link is too many, and would prevent it from biting into surfaces to get friction. v3.1 is the single tread. I'm going to print a full set