Gotta go out and weigh your TV fully loaded as if ready to tow. Total and each axle weights
Then gather TV's GCWR, F/R GAWR...and...trailers actual tongue weight fully loaded. If you don't have that, then the brochure tongue weight and note the dry weight..that will provide a ball park percentage tongue weight when loaded....unless it is a toy hauler, they have very different tongue weights empty and loaded
Now simple math to figure using this generic formula:
GCWR >= actual TV weight + Hitch system weight + Actual trailer weight
. If you don't have the actual trailer weight yet, use it's GVWR as the max it will ever weigh
Since you don't have the trailer yet, the formula should look like this:
Trailer weight (max) <= GCWR - Actual TV weight - Hitch system weight
There will be a need to check the actual tongue weight + Hitch System weight + TV's actual rear axle weight. That should be below the TV RGAWR