A rechargeable electric air pump with nozzle adapters. Charges by USB, runs cordless.

The advantage over a 12V pump is that it does not tie you to the vehicle. Inflate the mattress inside the tent instead of running a cord through the door.

Inflates and deflates — the deflate side matters more than people expect when you are trying to get an air mattress back into a stuff sack.

Charge it at home, charge it off a power bank, charge it off the vehicle. Covers a weekend on one charge for normal use.