When I first bought mine, I had a 2015 Chevy 2500 diesel. It was the High Country Version (max payload 2229) I was over max payload by 1000# dry, It was a bouncy ride to say the least. I ended up trading that one in and now I have a 2018 3500 DRW with a may payload of 4970. What a difference!
The pin weight on this 5er is like 3300#'s, we haul two 800# ATVs and I have the generator. Fully loaded with 30 gallons of gas in the tank and no water, I'm right at 17000#.
Nothing you do to your TV will increase max payload rating, I could have added another spring and airbags on my 2500 but at the end of the day it was still only certified for a max payload at 2229.
It was an expensive lesson, but pay attention to your TV max payload. I see TV all the time that are clearly overweight, I'm not independently wealthy and I did not want the liability!