PowerTanks work a treat. You can also run air tools off them. We thought of using one for our London to Cape Town trip, but went with a compressor because of the uncertainty of being able to fill up the PowerTank. In reality probably wouldn't have needed to fill it up.
Used a Viair compressor with a 3 US gal tank. The compressor supplies air at 1.3cfm which fills the tank pretty quickly.
One thing I haven't seen mentioned here in regards to compressors is the duty cycle. If you exceed the duty cycle, you run the real risk of cooking the compressor. The Viair I had had a 33% duty cycle (20min of operation per hour). The ARB has a 15% duty cycle, and with a supply flow of less than 1cfm, it makes for long waits during reinflation. But if you have the patience, it works well.
cheers
Graham
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