The RV type would probably need a custom design mount to protect it. I use to have my roof rack tied to the cage through the fiberglass shell and used a solid mount, so the rack and cage did not move separately to protect the shell.
I still think it would be nice and cool in 120° summer weather. And keep in mind, most people don't treat their Bronco like we do.
My Bronco is a Off-Road toy now that is a trailer queen to the desert most of the time.
Now power came up to run two of those systems I posted. On my Bronco for 25 years, I have been running a 200amp alternator I had done by Broadway Auto Electric in Lemon Grove CA.The reason I went to the high output alternator was when I would sit at the US border crossing for 2 hour's at 600 RPM's with the stock alternator and stock AC, it would kill the battery after a hour, then we had to jump it and we could not use the AC anymore. So the higher output alternator was the solution. The one they built for me was setup to charge at 130 amps at idol and hit max amps at 1500 RPM's. When we tested the amps it actually charged at 208 and 1500 RPM's. The first Alternator when I was daily driving lasted about 10 years, then they rebuilt it and I still have it in the Bronco now, for 15 year's. I am it rebuild mode on the Bronco from the ground up as a 50th Birthday present to myself. Two years into the Project and I have not driven the Bronco
. That is a major undertaking with a new motor, trans, axles and the hardest part, a whole newly fabricated body. 1986 to 1972 body swap stretched and widened.
What I was thinking, was a Vintage Air Conditioning system. After seeing this option, it would be nice to not have the compressor kill horse power when in the dunes, because I want to run the AC. I have been looking at getting a 350 amp or higher alternator, so I can run a welder. I definitely want two batteries and even was thinking the Lithium phosphate batteries for higher storage capacity and a 10 year warranty. I have not had good luck keeping Optima batteries alive. So a DC to DC charger unit that charges the Lifepo4 batteries at 14v keeps them in the best health and charges them completely. At a normal 12v charging rate, Lifepo4 batteries will only charge to 80%. I did want a Premier Power Products on-board arc welder that ran off the alternator, but when you are welding it would not charge the battery, so hopefully you would be done welding before the battery dies. So with new inverter technology and small inverter welders, I was thinking of one of new 200amp combination arc, tig and plasma cutter unit's. I can even get a 12v to 220v inverter to run the welder at a lower amp draw and better duty cycle. I will be running a on-board air and tank with a 7.5cfm compressor with a 3 or 5 gallon tank. I have a 3 gallon steel tank now, but I was thinking of a Lighter aluminum 5 gallon, I will have to see if I can make space. Having the Plasma cutter and welder in Baja, would be really helpful during races. I am definitely interested in a dual 350 amp alternator setup on the Superduty F350 like the Ambulance system and run that welder/Plasma system with 4 deep cycle batteries and a 125 watt solar panel on the roof of the crew cab. Maybe even run that new Electric AC compressor for sleeping in the cab on hot desert nights. In Baja I have left the diesel motor running and the AC running for 6 hours and it only used a 1/4 tank of the 29 gallon tank. I did have two 11 gallon fuel cans, just in case. But was surprised how little fuel was used. I already have the solar panel for the F350, because it tends to kill the batteries after two weeks of sitting. So the solar keeps the batteries fully charged. I have a little dash Solar panel on my mom's Chevy Tracker to keep the battery charged, because she doesn't drive it for weeks at a time.
Sorry for the long post. That is the result of a lot of time to think about the Bronco and being bored and stuck at home with a severely herniated disc in my lower back. This is why the Bronco is taking so long to get done.
I'm done for now
David
maybe run two, one in front and one for the back seat. It looks cheaper then going to Vintage Air or the other AC retrofit systems. 
I definitely have the time. 
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