I had the good fortune of finding a Dometic RC2000 mobile cooler (3-way) last weekend at a garage sale.� Having owned one before I knew what it was immediately and snapped it up.� I was kind of shocked seeing it amongst tables of baby clothes and kids toys. 
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They do get warm when running off propane, AC not so much. I never really tried running on 12v.
You can run it off a 1lb bottle of propane for a weekend with the included adaptor/regulator--does the craigslist cooler have that? You could also connect to a regulated propane supply.
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Our previous Dometic cooler was used in�our former�'90 MV (no kitchen) and worked out well. You could make ice cubes in it over night. It was a bit bulky, but what cooler isn't? We kept it on top of a large chuck-box behind the drivers seat. Used it on gas inside--with ventilation, fumes were not an issue.� These coolers seem much more common in Australia and are reasonably priced there.. I see Dometic compressor types have really come down in price too.
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I've entertained the thought of selling it but it's such a jewel of engineering and just plain cool.� The last one we sold, I got burned on shipping ($65).
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Chris C3
Wisc.
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Re: Dometic Cooler

Dumb question time.� Is the issue with venting the exhaust gas or the heat =
or both?
Is it really that big a deal if all your windows are open?� I can see it wo=
uld be an issue with propane heat=2C but isn't the exhaust off a fridge neg=
ligible in comparison?� Especially in summer with all the windows open and =
top up?
Trying to recall whether or not propane fridges (full size in cottages etc)=
are vented.� Don't believe they are?
Jeff