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The RV pump will work just fine (as one does in my truck camper).
The power draw isn't continuous since the pump cycles just often enough to maintain pressure.
Also no worries about wiring since 16 AWG would be more than adequate. And grounding to the car's frame would be okay too, but why not go the the battery since it's so close.
Since you'll have a on/off switch be sure to add a fuse in series, maybe 10A.
 
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