Whichever way you do it it'll be a great project. I was originally thinking along the lines of a rear support spring rather than a mount so the body still has support at the back, but the tail of the chassis can do as it pleases.. that said, I was pondering it in the workshop today as I contemplated pulling some stuff off my living body. So long as the cab has decent heavy rear mounts, this could be taken as 2 of your 3 or 4 points. As long as the rear 1 or 2 points were smack in the middle of the chassis rails the chassis could still flex as it pleases but carry the weight. I'm still leaning towards having a 4 point mount on mine, as I have used it as a truck off road carting rocks for our retaining when we built our house and the flex/twist off road was impressive/alarming!.... BUT, Neil's Merc (Cloud9) is testament that bolting direct to the chassis using bolts and springs also works. Guess I'll make my decision when I have a bare chassis and a body ready to fit!