Do you tow or do you rent one when you get there???

On your "great western adventure", I would hope you'll be spending most of your time out in the boonies far away from any rental agency.
Towing an appropriately sized dinghy behind a typical motorhome, you never know the dinghy is back there.
From my years of observation, I would say 97% of us tow 4 wheels down, 2% use some type dolly and 1% rent a car.
With a hundred vehicles of all different types now capable of 4 wheel down towing, its no wonder so few waste their time with a dolly.