Just got a TT, overwhelmed by what I need to fill it :)

Load it with the essentials, like hook up gear (hoses, electrical, leveling, chocking and such), dishes silverware and such. Then take your first trip within 10 miles of a Walmart or other camping store then camp for a few days.

We recently traded from a pop up to a travel trailer. I thought I had most everything I needed but we took our first trip near a town. I made five trips to Walmart to pick up little things I'd forgotten. Now, after a couple of more trips, we are pretty well rigged up.