I am brand new to RVs. Here's my problem, where the heck do you air up RV and tower tires? I have an air compressor at the house and it is rated at over 100 lbs with a 6 gallon tank. It won't come close to putting 100 lbs pressure in a tire. My tow vehicle is 2015 Chevy HD 3500 DRW and calls for 75 front and 65 rear pressures, cold. Again, no can do. Filling stations, fergitaboutit. Tire shops, not for free, I wouldn't think. So???????