yep it should be fine as long as its tieed down in some way, and turn the fuel off

and i dont no about carrying the bow, maybe like put your arm though the sting and the frame of the kinda like how a gun sling idea, they make bow slings too

you could just get a 50cc bike, there definatly powerful enough to haul you around, people get them all the time to ride around, full sized guys even race them like competively