I'm worried about pickup box height of my new TV

2012Coleman wrote:
What is a leveling kit, and why on earth would you need to use a kit on a new TV? :h :h

It is not a leveling kit. Trucks sit high in the rear so when weight is applied the truck will be at a level position or higher in the rear with a load.

Rear air ride is intended to have the truck sit in a level position when loaded or empty. This is an option RAM will be offering or is depending on what you read.