Hi , people.
Well, instead using dedicated xpedition air compressors .. I have bought a good 1000W 12V->220 Volt inverter for around 70 Euros+30 p&p , and a cheap hobbyist (sp?) 240Volts 1 HP air compressor , with tank and accesories !! , etc.. for around 80 Euros.
That way I got a 1HP air compressor which is really good pumping power... AND the inverter which doubtless will be of utility on the truck. Another advantage , is that even if the compressor fails , there's always the possibility to buy another (well , bit more expensive) but available 240Volt air compressors in Most countries.
Have a nice day.