We have two dinette areas for a total of three under-seat spaces. One close to the door holds hoses, extension chords, cast iron cookware and hotdog sticks. One holds the elsewhere discussed add-a-room. The third holds games and tackylights.
We have cabinets you can reach just inside the door. Those hold tubs with dishes, pots and pans, utensils, and the bottle jack for easy access if we need to level. Under the sink is a tub of cups, a 5-gallon fold up water bag, the "coffee pot" we heat water in, cleaning supplies. oh, and a nebuliser machine, hoses, etc (although, Praise GOd, I think we are outgrowing that - still wouldn't leave home without it!) and a hand cranked food processor that we NEVER use LOL.
One little drawer contains warrenty books, toothbrushes, sewing kit, first aid stuff.
And the true marvel of stuffong stuff - the cabinet that I believe was designed for a little potty. It holds our combo microwave/convection/toaster oven, a little car vaccum, a ceramic heater, two little bunk fans, and a crockpot.

wishing you never asked, aren't ya!