It was about some teens & a fat guy who was a mechanic & one of them lived in a camper/mobile home at a car garage mechanic place (maybe a grandma type of a character)

Is it possible it was "Brotherly Love"

"Brotherly Love" (1995) (http://www.imdb.com/title/tt0111901/)

YEAHHHH That's IT


Thanks a lot!:D