Thanks for the suggestions on the TST drop out. I'll try that on this next trip. I turn the system on and off daily, so it does find each sensor each morning. I've also started removing the sensors from the toad when we get where we're going rather than driving around with them on there. Takes less that a minute to put them back on when hooking up and let's the batteries rest. Drop out is intermittent and doesn't ever seem to be more than a few minutes at a time, so I haven't been real concerned with it.
On the range, they do have very good range in open spaces. Since ours is a DP, there's a lot of "stuff" between the gauge on the dash and the sensor on the toad.
The problem I had with the Tire Dawg system was that even with the range extender in place, it would lose the sensors on the RV itself - didn't even use it to monitor a toad. I turned it on one morning when it was a little more than a year old and all I got was an error message. Thinking it needed to be reset but not finding any directions to do that online, I contacted the manufacturer. They responded quickly and said they needed the serial number, etc. Once I emailed that back to them I never heard another word. Wrote several times, called and couldn't ever get an answer so I left messages. Nada! I don't need folks like that. When I bought the TST, I had a question on how to set the upper and lower limits and contacted the TST support folks. Had a response within the hour and they followed up the next day with a phone call to make sure I was going OK and to give me additional contact information if I needed anything else.
There are a lot of systems out there and I'm sure there are good and bad features to all of them, but I have been very happy with the TST. Good luck with whatever you decide to purchase.