under high torque you will have chain issues when they are misaligned as well. A vehicle I built had double strand number 60 high tensile roller chain and it still jumped teeth in the mud. We were putting down about 427 ft lbs at the wheels at top speed in low gear though, with 31" diameter Ag tires.
A cogged belt like he suggested would be a pretty decent idea if you could get it to align properly.
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