Go with 400cc Suzuki Burgman, CVT so all you need is throttle control, a servo motor and rc control so it would be wire less.
MC Front wheel towing system
I think I'd add some straps from the frame as well to keep it straight.
https://tow-ster.com/
400 makes about 30 hp, the 650 makes 55 is you think you need that much.