This is my 1st unit with H rated (17.5, 110 psi) tires. I have a portable compressor, but I don't think it is going to cut it. I have seen mixed reviews on the VIAIR 450P 12v. Anybody using it with H's? With a geny is anybody using a 110V compressor? If so, what model? You can buy a small one for about $130.00 and I was surprised how light it is. The VIAIR is 15 lbs and the husky at HD only weighed 30 lbs.