I initially ordered a tire pressure system from (I'll PM you privately with the name), and cancelled after 2 1/2 months of non-delivery. Although this system appears to be priced right, I cannot recommend them. To all practical appearances, this is a shady operation and I strongly suggest that you stay away from them at this time.
After that experience, I really studied several TMPS. I think the Smart Tire System is probably one of the very best, but the thought of having all my tires removed and the units placed inside the tires was too daunting for me. I don't like anything that takes my toy away from me!
The Pressure Pro and Doran RV360 are similar. Doran used to make the Pressure Pro. Maybe they still do - I don't know.
The RV360 is pricey, but worth every penney. It constantly monitors, updates, and gives you a 'green' light when the pressures are okay. At any time you can press a button and look at the individual tire pressures. A red light means trouble.
It is really easy to set up. The biggest plus is that after being completely disgusted with the first company, I ordered from Doran on Monday, regular delivery, and received it on Thursday morning.
US Army Major, Retired
'08 Monaco Diplomat SFT,
'11 Z-71 4X4 toad