Making sure you have the proper PSI in your tires is critical for safe RVing. The best option is to have your own air. It’s a device that sits in the cab of your truck of motorhome that shows you the current PSI and temperature of each tire. TPMS stands for Tire Pressure Monitor System. That was three countries, thirty-eight states and over 45,000 miles ago! Keep Your Daydream here. Finding air on the other hand is pure torture. After years of waiting for the right scenario or the ideal time, we decided to trade-in our “perfect dream” for what we were actually able to do right now. These devices are critical because they can detect and alert you of a leak prior to a blow saving you from an accident or costly repair to your RV. The VIAIR 400P-RV Automatic Compressor Kit connect directly to the battery on your truck or RV with plenty of hose to air up your RV tires.