I had a Colorado when they first came out. 4x4 Totally loaded, 4 door 5 cyl. Towed my Z3 to some autocrosses with it on an 18' open steel deck trailer. Truck squatted quite a bit and in general felt unsafe. Power was adequate. Sold it for a new f350 powerstroke in '05. Glad I did. In true U.S. automaker fashion the horsepaower was OK but nothing else was.

I think it's risky; YMMV.

R