I have a couple of addictions, one being adult beverages, and the other, the Internet. I love my mobile hotspot. No matter if you are in a campground with WIFI or not, if you can get a cell phone signal, you have Internet.
I think a lot of people forget to bring a good corkscrew. Nothing sadder than a wino with no way to pop the cork. I am also very proud of my exact fit folding table. The storage area has a nice molded spot and the table I found at Costco fits perfectly, and there is still plenty of space under it to store........more wine!
I keep my stemware and other things that rattle around in boxes with separators which also keeps the stuff from sliding.
CHARGERS! Don't forget your cell phone chargers. I use a CPAP machine and I just got a 12V attachment that allows me to run it off the house batteries so we can go dry camping and the wife does not have to suffer through my raucous snoring.
LIGHTERS: Camp fires are no fun using the flint and steel starting method.
A storage bag for your dirty clothes. Makes it easy to get them back in the house for washing.
Rubber bands/duct tape/rubber disposable gloves
MEDICINES/pain relievers/bug stuff
A memory foam topper does a miraculous job of transforming the el cheapo mattress that came with your RV into a luxury bed. After using it, we liked it so much, we got one for our bed at home. The only bad thing s it makes it a LOT more difficult getting out of the sack in the morning. On sale at Costco!
Without even looking, I'll bet the library attached to this forum has a list of stuff.