In all honesty as s multiple pup owner I know the ins and outs. Not one bit of food storage in 8, 10, 12, 14, and sixteen feet.
Anything larger than 12 feet on single axles offers low ccc. Any highwall needs a dual axle setup.
My current 12 foot unit I went without a cassette shower setup to at least get a 3 foot counter. I top of counter I put a Cabelas folding dresser. Gets one side for me and one for girlfriend to pack.
Kids on trip whether mine or her 1. Or multiple. Logistical difficulties on clothes storage. Good food storage and towels
Shower suspension shelf whether in pos 8 foot to overweight 16 feet
Food storage hmmmm. 1.9 to 3 cubic fridge Doable for my tribe fir 2 days but add 1 to 3 more days or kids all bets are off and it's big coolers.
Cooking. No placd for pots and pans or necessary silverware. All pups
All pots and pans and service for 4 goes in a chuck box.
Did I mention all gear goes in truck
Did I mention one ton truck
Big cooler,six bags, 10 towels and a chuck box and six passengers
My old hybrid in profile picture could sleep 6 adults but would have at least 2 of them self support themselves fully with bags and provisions in the truck.
My tow vehicle has 2451 pounds of payload, 4 captain seats, and comparable to many 3/4 ton pickup trucks. I removed my 3rd tow tumbler to gain more storage space.