What must have truck accessories do you wish you added first?

Finally picked up my Tundra last month and now I'm in that phase where I keep adding things to my cart and deleting them lol been looking at tonneau covers, bed liners, floor mats, running boards but the list keeps growing and i don't even know where to start anymore.

It will be my daily driven car and also planning to do outdoor stuffs so I will be carriyng lot of things.

What is one thing you added early on and you actually use all the time and what do you wish you skipped?