assuming its vinyl. park it facing the sun. Careful with a heat gun, they can be too much and wreck the paint. NO RAZORS either. Heat (hot sun/hair dryer?), and picking at it will get it with the least damage. Mineral spirits will help with adhesive clean up. Ex sign guy here.
I agree that with the rear stick in place, the seat sliding further back then intended in flight would be a problem. The one I know has no rear stick installed ever.
But that would defeat the o.p.'s question of trying to get someone in the front and have a safety pilot in the back. maybe a pin...
the small bolts on the top of the case that hold the halves together have bumps of extra material above them all the way down the case. so bumpy back. the others are a smooth front to back with no bumps on top
mine. they work great! I have one in a camper as well. Very efficient on fuel and battery. Require about 15amps to start, then after a few minutes around 4 amps to run. This one was $115 shipped. Some have better controllers than others, so might want to research that before ordering.