I too think that they should be required on RVs. RVs consistently travel further distances at a clip than the average car allowing a picked up nail much more time to leak a tire down to the danger/fail point. With your car you come back out of the store to find a flat tire...Your RV blows an overheated, low pressure tire at speed. Checking pressure in the morning with a gauge doesn't do much for the roofing nail you pick up pulling out of the campground. I personally have an EEZ system. Has worked great for 2 years now. Takes about 5 minutes to get all the readings up when it turns on with the ignition.