Most of an air compressor's move-day weight is trapped moisture sitting inside the tank, so draining it fully before you lift a finger does more good than any amount of careful carrying. After that it is just coiled hoses and a steady, upright load.
Pro tip: A quick coat of light oil on any exposed unpainted fittings before a long move in a humid truck prevents surface rust from forming by the time you unload.
Watch out: Never skip draining the tank before a move; trapped condensation adds unnecessary weight and, left long-term, is what rusts a tank from the inside out.