Any brand you can get 120psi will do the trick for a gasser with 19.5 tires. 225 or larger diesel coaches may require something a little more hefty. I have a smaller coach and carry a Sears, one tank, oil, 125 psi in my coach. Love the thing, no problems and check my coaches tires religiously,.
I've been shopping for a dual purpose air compressor. One that will not only air up the tires but blow out the water lines to winterize. Plus operate on 12 Volts DC. So far I'm looking at the Smittybilt 2781. 12VDC good for 150 psi and 5.65 cfm of air. I have some questions in for the manufacture because I want to adapt the output to standard air hoses with disconnects. I also want to add my own pressure gauge so I can adjust it to not go over 45 lbs for blowing out the water lines.
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Harbor Freight makes tools that serve a certain purpose.....and I've got lots of them, but I don't know if I'd use their compressor, because they are usually better if you are only going to use the tool a couple of times. If you have the storage space, I'd recommend getting something like a "Pancake compressor" like THIS one from Home Depot. It's rated to 150 psi, so should meet all our needs.
A bit pricier than HF, but a better made piece of equipment, and you will find that you use it more than you think....at home and in the RV.
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I got a small 1.5 gallon compressor from Dewalt (emglo).
Runs 130psi and with the adjustable regulator & clip on chuck makes filling 22.5 tires easy. Will fill a flat tire in 7 mins.
What I have noticed is when you have a long fill... it tends to condensate so I put a dryer between the compressor and air line. Plus its small and easy to carry.
This is it http://www.factoryauthorizedoutlet.com/d........140.asp?gclid=COXGqqrCpa4CFYuc7Qodr2ItSg