I carry one of these MV50 12VDC Tankless Air Compressor since around 2008... I got mine from AMAZON... Have seen them in Northern Tool...
It used to air up tires pretty good but I guess it is getting worn out now. It would take a very long time to air up a 120lb tire now...

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If I was going to get serious about airing up high pressure tires I would use a 120VAC tank model air compressor...
My tankless 12VDC model is great for keeping tires aired up and filling tubes for going down the streams etc.. Also great for doing my real quick winterizing for my off-road POPUP trailer. Just takes a few minutes to blow out all of the water in the water lines. Also great for airing up my air matress when in camping mode...
Roy Ken