[SteveC7010]

If your Suburban has 3.73 gears, it is rated to tow 7,000#. 4.10 gears give another 1,000# of capacity. If you have shorter gears, like the 3.53's, your towing capacity is diminished, probably down to 6,000# or less.

The spec dry weight for your trailer is 6,109# with a carrying capacity of 1,391#. Add them together to arrive at a GVWR of 7,500#. I suspect the Suburban is already well loaded up with family and stuff as well.

Without know all the numbers for your TV and your load, it's difficult to give a more precise answer, but the bottom line appears to be that you are probably at max capacity for that truck, or even overloaded.

If it felt sluggish with your stuff and family on board, that is undoubtedly the reason.