The best way to determine what size air compressor you need for your RV is to find out what PSI you’re tires need to be inflated to. This information will be in the manual or on the sidewall of the RV. When you know your PSI, the compressor you need is going to need a higher PSI than your tires. For example, if your tire pressure is 50 PSI then you are going to need a compressor that goes above 50 PSI.