I can suggest 2 25ft bright orange electical extension cords, a surge protector, a fresh water hose (I like the 25-ft pocket hose) sewer hoses and bent extension with hose connection, cargo carrier, bicycle rack. Perhaps some battery chargers.
Don't know what TV setup you have built in.
Get yourself a good spade, an axe, a hatchet, some wrenches for the sewer hookup. Consider a bottle jack. An air compressor is good to have. A general purpose tool box. In my case I also have a box of electrical spares and tools. You could consider a big tow strap and a hitch adapter for that.
A collection of bungee cords and some rope will do you good. Folding camp chairs, and maybe a BBQ. We have both a gas and a briquette type depending on the campground rules.
Bicycles are very convenient. I'm about to build storage under the frame for the sewer hoses and another for fishing poles.
If you go to camping world you will find a plethora of goodies you never thought existed and will suddenly feel like you can't live without such as awning lights or other decorations. Watch your wallet.