Just a quick update.
We returned to the dealership and they could not determine what caused the brakes to lock. For assurance they replaced the controller (Quest - $250), and checked brake pads, hubs, controller, wiring on TT plus TV. They reset it at 50 for resistance. We also had our TV taken in and checked as we were planning an 800km trip to northern Quebec with NO RVcare service. It was fine as well - thank goodness. We had no issues except a noisy sway bar (it was pouring), and a bit of condensation/leaking? on one bunk end.
Also I may be new to posting, but have been researching this site, and many forums for YEARS prior to purchasing this TV and HTT. This one is a step up for us but we have been towing and camping for almost 20 yrs. I always offer advice without prejudice to those who need it, on topics I can offer helpful insight on.
We all have to start somewhere, you can research all you want, but at some point you have to make a decision based on our research and accept that things don't always happen the way you planned. Besides if it wasn't for "people like me" forums wouldn't exist.
Thanks to everyone else for your helpful comments. :)