I'm still basically stock, but I did add a wireless TPMS to the TT along with a wireless camera on the rear of the trailer.
I put the camera display up on the dash. After I formed the metal to fit into the dash tray, it sat there without issue...but I did add velcro to make sure it doesn't go flying forward during a hard stop. My main goal was to make it easy to remove when I wasn't towing:
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Since the display for the TPMS has a battery (that is charged by solar or by USB cable), I was free to mount it way up front in the corner of the dash with more velcro:
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Then finally, I have a really good WDH with integrated sway control. It's a Husky Center Line:
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Not related to towing, was also able to throw on the new tonneau (Bakflip Revolver X4) with a BedRug under it. I don't have pics yet since it has been raining all week...