I cartop the Wave all the time. I have the boat set up and broken down in 30 minutes at each end. However, he's said he doesn't want a slower boat like the wave. Lifting the whole platform on top of a Hummer would be a serious backbreaker for anyone short of world's strongest man contenders. If you've got the cash, I've seen some seriously cool trailers that haul a car on the bottom and have a 18-21' skiboat on top! I should think a special trailer would be best since cartopping a cat platform is time consuming and hard on the back. Are you hauling the RV with the hummer or vice versa? Assuming you would be hauling the Hummer with the RV here.