If you go 2wd - just make sure you take ALOT of heavy friends. They can all jump in the back and ride the rear bumper up the ramp.
I have a 2wd - 3500 chevy. I learned quickly. We take the 4wd Yukon and 3500 to the ramp. The 3500 pulls it there, we hook the Yukon on it at the ramp to off load and load, then rehook the 3500 to pull it home.
NEVER AGAIN will I buy 2wd to pull the boat!