Tex,
seems as though I used 2" pipe for the outside frame or was it 2" tube....no, it was pipe cause I bought the weld 90's. I'd have to measure what I put inside of it. Mine is a three stage though. That sucker will shade on both sides of the truck and the back without moving it. I'm gonna go down and check it out right now and let you know. Was supposed to let a friend know the sizes months ago and just have not got around to it!! Now seems like a good time!