Chevy express Towing U-haul flatbed w/ 4650LB trailblazer

yeah G80 is a must don't want a one wheel wonder. the preferred AWD mite be hard to find down south I do see the AWDs up north on icei slippy roads.

I thought all express's came w/ g80 and the option is gear ratio.

I'd like the biggest strongest hitch like a class 4 at 1K tongue weight & 10K for load even thou I'm only towing less than 1/2 that weight.

so are the 1500 hitches same physical size making a 3500 4 class will fit a 1500?
thanks