I went in & told the manager I needed a twin size set for a 39" with frame. I bring it home & it doesn't fit the frame. Only 37 3/8. I search online & every site say it should be 39" called every mattress store & said same. He says no, it should only be 36-37 & he wont take back or exchange. Their website only has 5 star reviews. Obviously they have to approve them 1st. I was sold a mattress for a camper?