OP wrote:
I certainly don't want to get in any kind of white knuckle event. I've taken the Mfg's MAX GROSS TRAILER LOAD AND DEDUCTED 20% for safety.
Sounds to me like you are trying to skew the numbers in your favor. To correctly calculate tounge weight, you take 12 - 13 percent of the TT's gross weight.
Making the justifiation of just not loading it to it's max weight or doing fuzzy math does not hold water.
Why don't you post a picture of your door jamb sticker? Better yet, load up the TV for camping and take it to the scales.
I looked your choices up on a few sites and they seem to agree - 8500 and 7000. So calculated at 12 percent thats 1020 and 840.
If the you have to upgrade one or the other, strt with the TV. Otherwise look forward to your white knucled towing events. Good luck on your choice.