Viair 40047 400P-RV Automatic Portable Compressor Kit

This is a real, heavy duty Air Compressor to fill RV and truck tires. It is pricey, but well worth the cost over cheap, low quality units. It attaches to the engine or house battery terminals for power.  There is a built in air gauge, long hose, connector for filling dual wheel tires, and a convenient carrying case.  The soft case is compact and easy to store in a RV.  It is a bit slow to fill, but will get the job accomplished. Put it on your wish list, it does come on sale quite often.