I'd shoot for the light side first. Say two drivetrains out of a couple of Zero Turn riding lawn mowers, use a frame from one of the 2 seat adult go carts. Wide'n the suspension to get more wheel travel, use one engine and have an extra drive motor geared for the desired top speed. Keep the weight to 1,000 lbs dry would vastly increase climbing ability. My old go cart went 30mph with 3 HP, though it was not hyd. drive.
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