I agree with "Former Boater" and have the same Sears compressor. I always wonder why so many people seem to need to fill their tires with air so often, especially while camping. Why don't people check/fill their tires before a trip. I check mine twice a year and they typically need 1-3 pounds.
I've owned a DP for almost 10 years now and having air hoses for the coach is really worthless. Typically, the onboard compressor can't generate enough air to fill a 22.5 tire in a reasonable time, if at all. If you dump your air when you park and level, your tanks are pretty much empty and useless. Even if you use your air for bicycles or blowing dirt off shoes etc, there is not enough volume to do it for very long.