Four wheelers are very commonly used by farmers. They don't bother the deer as bad as you might think.

My uncle and I sat near a dugout after riding in on a four wheeler. We left it 100 yds away. We still saw deer.

Around here, deer think nothing of vehicles, farmers are leaving tractors, trucks, pickups etc out in the field all the time. Deer will walk right up to a vehicle. I've seen them do it with people sitting inside.

As long as you can pull your bow, get out and hunt.