If your worried about sage, I installed a set of Sumo helper on mine to keep it from saging too much. Also, It's important to try to keep the trailer level with the tow vehicle. I went on Amazon and bought a adjustable hitch with a 6 inch drop and can be used either way to adjust the ball...
Having mine replaced. If it comes back, I'm going to just replace the pads with some CarbonMetalic pads. That'll shut it up. I never did like Ceramic. No dust but, worthless when they get really hot. Found out the hard way on my Tundra.
Took mine into the dealer today and was told that Lexus is working on a update on this issues. Mine gets stuck in night mode at times. Replace the brake pads and going to flash the transmission. Long delay into gear in the morning and double shift before moving. Some other small issues also...