Two years ago I purchased a Coleman Powermate 250 psi compressor. It has been more than adequate at maintaining tire pressure for our TM and TV. The compressor is still available. Here is a link to one supplier:
The battery for our TM is located in the rear storage compartment. I found that the 12 volt Coleman Powermate would not easily reach the TM tires (from my TV). To alleviate that problem I purchased a volt adapter from Radio Shack:
I use one of those emergency power packs which I keep in the SUV and which is a rechargable battery/jumper cable with built-in 12v compressor - about $50. It's great for inflating the tires (albeit a little slow as all 12v compressors are). It's advantage is that you just carry it to the tire wherever the tire is or whatever it's mounted on - no wires or vehicle/building required nearby to provide power.
Of course it also starts a car with flat battery, and is a general backup power source - it's great when coupled with a inverter when there's a power cut.
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