jump down to a big box hardware store, there are many choices. even a portable battery powered unit (no cable for power thing).
but if you buy a ac voltage unit, KEEP your power supply aka generator turned on.
you can even think hard mount, and only have to run around with a air hose to each tire as needed. as even the small units can get "heavy" the cheap inflaters at wally world, k-mart (they still around?), cost-co. are just good to loosen your wallet. and some can not get up to 100+psi. no tank, and will take a very long time to get any job done.
read the working psi, load ratings, and service time.
for about $150 usd, a very good unit can be bought. add in fittings and air line, you will be golden for any air needs.
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