So I found this web page which may be helpful and answer a lot of questions:
COLEMAN 15000 btu RV ROOF AIR CONDITIONER Top Unit - $575.90
Note two things:
1) The chart about 1/2 down the page that shows the running watts needed at different outside temperatures. If you want to know why a "Hard Start" Capacitor is needed on an AC, look at the "Locked Rotor Cooling Amps" - this is the amps the AC draws for just a second on startup. If I did the math right that's over 8kw.
2) The other is in the diagram near the bottom of the page with the cutaway photo of the AC. One of those arrows confirms what my Dealer Service manager told me last year - all new Coleman Mach units are already shipped with a hard start capacitor (SMART MOVE Coleman!) And if you have an older unit, it's easy and cheap to add (or have your dealer add) a hard start capacitor. Haven't researched the Dometics and no, I don't know what year they started adding that feature - perhaps someone else here does.
As for me, I intend to purchase the 3200w/3500w Dual Fuel. I'll probably never run it on Propane while camping but I'll also use it as a home backup generator. And at home we're on a huge in ground Propane tank. I already have a propane quick disconnect outside the garage - I could run it for weeks without refueling.
As to getting it in/out of the truck bed, I'm adding a "Harbor Freight" 210lb winch to the ceiling of my garage.
One thing I can't figure out (unless it's a typo) is why the larger generators in this series get lighter? Have you noticed that? Look at the specs for the Champion dual fuel inverter generators - there are 3 of them - 3100, 3400 and 3500. They are all the same size. But the larger the wattage, the lighter the gross weight.
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Buddy Ray - Atlanta
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Jayco 2016 Eagle HT 26.5RLS
Ford 2016 F150 Lariat, 3.5L V6 Ecoboost
Max Tow Pkg, 36gal tank
Reese Sidewinder and Reese Titan 16k hitch