Things I always have in the camper, that I always use
Travasak and pillows.
Coffee cups and drip coffee device, plus coffee pot to heat water.
10" frying pan to make breakfast.
sharp knife for food prep, two meals/two people worth of silverware, spoon for cooking
small dish drainer
two big bowls for dinner salad
disposable plates
trash can and trash bags
paper towels, dish dry towel, scrub sponge, dish/hand soap
full water tank, prepped Cassette toilet, toilet paper
plastic drawer of toiletries for each person
door mat and shoe cleaner
Things I always have in the camper that I sometimes or rarely use
Shower hose curtain
2 plastic plates
2 plastic wine glasses
Cheaper blended Scotch
wilderness first aid supplies
normal comfort first aid type stuff
2 qt pan and lid, 8" fry pan
too many spices, olive oil
alum. foil, sandwich baggies, food storage containers
cutting board, pan drainer, a few canned and boxed food items just in case
bug repellant, headlamp,kleenex, bleach towlets, cassette toilet refill chemical
down slippers, camp shoes
a couple games and deck of cards
Things in the truck I always have
leveling blocks
grey water container
recovery supplies
emergency tools
step in receiver hitch
Other stuff I pack as needed for the intended activities, camping location and trip duration.
I have about three normal packing boxes full of stuff that I used to carry in my former camper that I decided not to put into my current camper. The only thing I carry more of, now, is wilderness first aid supplies, since I have had a couple 2 days classes and have decided to acquire and have available more of that kind of 'stuff'. I carried around a lot of crap that I never used, or used once just because I had it, that I don't carry any more.
I weighed the setup and with a receiver rack full of firewood and other toys along I had 1000 lbs of payoad remaining, so weight concerns are not a factor for me.
I don't think I have any ingenious storage ideas.
But I did buy two plastic draw things so we each have a readily-accessible toiletry place in the camper, and because I have only one drawer in my camper, this has been a really nice way to help assure we have the basics along each trip.
Removing the back seat from my truck and making a flat floor with side-accessble storage underneath allows me to keep some tools and emergency stuff ready and out of the way, while allowing a larger area for the activity stuff I load up based on what the trip activities are. I rarely even need to load anything into the camper besides our clothes and food, which makes the whole process of camping more fun and less hassle.