The original SERVEL Swedish gas refrigerators were heavy.
Why?
A nickel-rich steel alloy was used and it was thick. But the pilot flame was too exposed. And they were hypersensitive to remaining perfectly level. A guest lodge in the Sierras converted to low head low-head hydro and as a thank you for me, all seven 1957 model refrigerator-freezers were given to me. Late models, with 2-doors. People down here came near to fighting over them. Five hundred dollars each. Simple to operate and when kept level their lifespan was amazing.
They iced up with the humidity and could have used better insulation because transportation caused the insulation to settle.
Quicksilver has a 400 amp 28-volt brushless alternator that when called on delivers 400-amps at a dead idle. I carried a Converted BELT DRIVEN Honda generator. It had a brushless 45 amp 28-volt alternator. At 3.600 RPM it would deliver the 45 amps. I would park a couple of hundred feet downwind from other campers.
It all worked out fine. But I always came second to other campers who did not emit diesel noise and fumes. The bus holds 190 gallons of diesel which was then priced at, 15 fifteen cents per gallon. Twenty-eight dollars per fill-up.
A person has to ask themselves a bunch of questions and then answer them honestly beforea making a satisfactory decision about which refigeration to use.