Some good suggestions here. I have been full timing with a 120v small pancake air compressor - which I love - as it is able to keep my 22.5" Class A tires inflated to as much as 100psi - no problem. I either plug it into a RV park site receptacle, or more often, run it off my 1500w inverter. Also used for bike tires and occasional blow up float tubes.
When looking into compressors several years ago came across the Viar models - but rejected those (and many similar styles) for my use as they were fairly expensive and required a long run of a 12v extension cord - which I did not have. But the biggest reasons I rejected that style is that they are all high pressure, low volume pumps. Meaning that they have to run forever to inflate beach toys and large RV tires which might be seriously deflated. (Which happened to me when I had a loose valve stem on an inner rear dually.)
In looking now there are A LOT more options. Some very good small pancake air compressors available - like Dewalt - but less expensive ones from Harbor Freight. But the newer ones which I like the best are the Ryobi battery powered ones (Home Depot) or the more expensive one from Milwaukee- which just came out. (I really like Milwaukee tools - though pricey).
If I were to buy another today I would opt for the Ryobi - $99 w/battery at Home Depot. Goes to 120psi and has a 1 gallon tank. I really like the battery option because it means no extension cords! Link: