Are you talking a fixed axle? Or a floating/swingarm/leafspring suspension? Technochicken built a golf cart with the stock leaf spring suspension on it and just bolted the pillow blocks to the leaf springs and put the axle thru them, mounted the motor were the batteries normally are. What happened is every time you hit the gas to hard or went over a bump, the chain went slack and it fell off. My personal recommended path for you would be to mount the motor on a platform mounted to the axle with pillow blocks, then add suspension. Sounds like this machine is going to be pretty cool btw!