Shopping for air compressor

Not trying to hijack the thread but what is a good unit for detailing only? I run a part-time mobile detailing business. I only have the back of an SUV as storage area, so it has to be small if possible. I will NOT be using it for tools or anything else besides getting water out of wheels, crevices, door handles, engine bay, and interior. Any suggestions?
 
I have a SanBorn 3HP 20 gallon, but they sold out to Ingersoll Rand. This is from the late 80's early 90's and work great. My is oil, belt driven.
 
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