If you need a portable, light compressor that is virtually maintenance free than consider the Atlas Copco AH series of Oil Free air compressors.
The 1.5HP Atlas Copco AH15E24 is a compact direct driven compressor mounted on a 24 Lt tank. With no oil or belts to change, maintenance is reduced to an absolute minimum. They can be laid flat in the ute for transport.
Weighing in at just 18kg and made with industrial grade wheels and handle, you can easily haul this air compressor anywhere you need to get the work done.
The Atlas Copco AH15E24 pumps out 156L/m (5.6cfm) which is enough to run a nail gun and small air tools.