i bought this truck because i just had triplets and needed an extra row of seats, immediately after i bought the truck i heard a scrapping sound from the back. recently last month i drove the truck to work and the car started grinding when i mashed onthe break. the rtuck stopped completely and wouldnt move. it started up buut when i revved the engine it would not move. took it in they said it was calipers. they replaced the tire. now the tire went flat again and its now making the same sound it was before. someone please tell me what the hell is fwrong because im so sick of this sh*t breaking down and these dumb ass mechanics dont seem to know or care either. thank you