RV A/C Unit On Truck

why would you worry about resale of the truck?

Yes there are a bunch running with an RV A/C unit, but they run off of a generator.

 

If you're thinking about running it off the truck's batteries I don't think you'd have much luck. Any of the units I'm seeing that run off 12 volts look like they are pulling 50+ amps. Your battery group will probably be dead in around 6-7 hours tops would be my guess with 4 batteries.

 

I should have added to my post, sorry.

get a split a/c system, no cutting holes in the roof,

 

THIS! There's absolutely no reason these days to go with a loud, inefficient RV roof top air conditioner, even in an RV. Go with a mini split on the back wall.

They are much more efficient. I run mine off two 280 L-ion batteries. If you need it for more than a full day/night then just power it with a Harbor Freight remote start generator. It's so simple it frustrates me to think about all the shoddy RV roof airs I had on various vehicles.

 

Where does the cold air go in and the hot air go out from???

 

This will do it LiTime 12V 560Ah Lithium Battery for Off Grid Solar System

Or get these group 31 ones
LiTime 12V 140Ah Dual Purpose Marine Starting Battery

 

It would but the poor alternator that has to recharge it after. Probably have that alternator working at close to 100% output for a couple hours straight.