I have a Doran system (in fact I have 2 of them which I used when I had two trucks at the same time). I used it when I was towing a 38' 5th wheel and never needed any remote antennas, worked fine without. When you have sensors on the trailer and you unhitch you do a drop hitch to the unit and the trailer disappears from the screen so the monitor just looks at the truck. Then when you hitch the trailer up you do a hook up and the trailer reappears. It was designed orginally for 18 wheelers so that was the reason for the drop and hook up feature. You can set the pressure anywhere up to 150#. It does not have a temp setting but if you have a bearing going out it is going to cause the wheel to heat up also and raise the tire pressure and the Doran is set up for high pressure as well as low pressure.
I have metal valve stems and I wouldn't want to run them without them. I have never seen any problem with it causing any out of balance problems.
