My opinion, that I have posted here many times is that all RVs should have a TPMS. An RV generally travels long distances each day giving a picked up nail plenty of time to leak your tire down to the danger point. Most trips in your car are short ones that result in you coming out of the store to find a flat tire. I suspect many blowouts blamed on 'cheap tires' were caused by a slow leak that wasn't detected in time and the resultant disintegration of the tire erases all evidence of what really happened. For the sake of you and your family, get a TPMS.