I am wondering if it the extra weight of the Kenny Kong tracks that is helping. I take lead shot in zip lock bags to add ballast to the tank if I find it having trouble with traction.. I have this T-34 chassis, but have not really run it much. It is pretty heavy though. so I wouldn't have thought it would be a problem
You might be on to something. I run mine with two nonstock batteries wired in parallel that adds 14 oz to the weight and I haven't had slippage issues.