[KenWittlief]

another requirement for your cart design. It will also be used to move the bot, and probabally other stuff as well, from your bus across a parking lot to the regional pit (maybe a long distance - in the rain or snow) and you might want to use it to make several trips to move tool boxes and team buttons and cases of drinking water

it would be a real drag if you had to get your cart across a parking lot in the pouring rain, and it would only go 2.5mph, or the batterys die in the parking lot on the 5th trip

and consider other events too, local off season competitions, when you may not have a coachline bus to carry your cart?