Found this out...
Box width at top: 59.0"
Box width between wheelhouses: 47.3"
Tailgate width: 51.4"
The RZR S is 60.5" wide so it will not work for what I'm looking for.
I know the RZR is only 50" wide but that's not the one I'm looking at and I'm still not sure if that will work.
For the sake of other H2 SUT owners, I'm going to find out if it will work for other applications. ATV's, Golf Carts etc.