Pen and paper, so you can write down the items that you did forget and for the items you now realize would be good to have.
Write them down, don't trust your memory, you forgot them once, you'll forget them again.
Newspaper and lighter stick, need a campfire.
07- Classic 2500 LT CC 4x4 SB Duramax/Ally
13-320RLT Crusader TE
Reese 16K Kwik Slide/Prodigy brake contoller