I would do what I wanted to do the truck is yours. If you went to a car lot to buy you a car they would not tell you what to do with it. Your paying for it it's yours. I he dont like let him take it back and give you your money abd then he can just let you borrow it. He will get tired of it and give you the truck. You have him over the barrow play your cards right and you will get it for free. He should give it to you any way. Sound like he has another one and you a without. My dad would.