The important thing when choosing a compressor for your ARB is to get one that can start with 100 PSI already on the tank. You will need a small tank, and a pressure switch and probably an adjustable regulator. IIRC, the ARB needs 90PSI to work, but can blow seals at 105PSI.
Im currently running my OBA to power my ARB, but I've run the MV50 pump as well. It is rated to hot start with pressure and it worked fine. I fill my tank to 125 PSI, then the pressure switch turns off, the compressor restarts at 100 PSI, and I have my regulator set to send 95PSI to the ARB.
Tom