We’ve had a checklist for more than 20 years, it became a lot easier to modify it as needed once it was on the computer!
We have a couple of versions: standard camping, camping with bikes or a backpack trip for DH, etc.
Since we moved from a pop-up to a travel trailer last fall, I’m now modifying the list yet again. I almost need two – one for season start up, when all the stuff removed for the winter is put back into the camper, and another for during the season.
Basically, the list is divided into sections such as shelter (the camper itself, plus shade canopy, site niceties like patio mat, etc.); sleeping: bedding (in the ground tent that included sleeping pads and the like), pillows; clothing; kitchen plus sections that change for backpacking or bike trips