Many years ago while camped out at Outdoor Resorts in Palm Springs I removed all of my brand decals .
Warm days and hairdryer method .
There are many RV shows in that area in the winter .
One of the decal places " RV-Graphics " had a display at one of the RV shows .
For a few hundred bucks I got ' fancy motorhome " swoosh decals installed .
I also got the matching swoosh for my gmc tow vehicle .
This was popular at the time .
None of these aftermarket decals has shown any deterioration of any kind .
The aftermarket decals are higher quality and cheaper price than the factory brand decals .
$ 1200 would easily be an installed price for your TV and your TT .