Being an avid tent camper from days past I learned to carry the 12VDC TANKLESS model portable compressor - The light weight compressor and all accessories all fits in a small tote bag...
I use the Q Industries portable MV50 12VDC 150 PSI Air Compressor for airing up tires and with the CAMCO 36153 Blow Out Adapter for blowing out the water lines... Since this unit is tankless it slowy build up air pressure which makes it very safe to use for blowing out plastic water lines. Everything available from AMAZON
I too have a generator but having the portable 12VDC version compressor fits my PLAN B situations much better.
This 12VDc compressor being setup on the tailgate of my truck when in travel mode taps into the 12VDC batteries on the trailer tongue can service all tires both truck and trailer..
This unit is also my source of air for BLOW OUT of the water lines when unexpected cold nights catch you off-guard by connecting to the fresh water inlet using an adapter. The compressor without the AIR TANK builds up pressure slowly and allows me to walk around to all of the water spigots to blow out all water lines. I can winterize in a very short time frame and can revert back to normal by just adding water to the tanks.
My 12VDC tankless compressor serves the kids at the camp grounds for airing up their bicycle tires and on a few occasions aired up some air mattresses for the tent campers... When the word gets around you become king of the neighborhood hehe...
I carry my 12VDC compressor under the back seat of my truck
Just my thoughts