When mine had to be towed a few months ago, they put the flat bed down on the ground at the shallowest angle they could get it at and had me sit on it while they pushed it onto the ramp so that the rear wheel was just on the bed. They had me stay on hit, one foot down and BOTH brakes applied while they raised the bed back up. They we moved it close to the front and tied it down using the triple tree with the bike sitting on the side stand. Two tie downs at the front and one at the back going through the rear wheel. Bike was fine all the way home, although 3 200lb+ guys in the cab of the truck was pretty tight!
Removal was pretty much the reverse of putting it on.