It's the two of us and the GB. Well the sticker says ours weighted about 10,500# when she left the factor. We added a 2nd AC unit, changed the mattress and modified the Master bed (4" tilt for my reflux). Set up the camper as a 2nd house and we scaled out at 12,000# with empty tanks, so we added 1,500# give or take. GVWR is around 14,000# so we have plenty for margin of error for tank volumes (48 gal fresh and 160 gal black/grey).
A stocked pantry weighs more than people think and camper is often stocked better than the sticks and bricks during the season. We carry a 12x12' dining fly and 10? lawn chairs. A tote of tool and a tote of "grill stuff", grill and grill grates for over the fire and a pair of folding tables to rest my drink and kindle on. It all adds up faster than people thing. Believe it or not we still have empty or under utilized storage spaces.
We like to meet up with our children and grandkids at a camp ground for a week. They stay in a cabin but we carry the lawn chairs etc.. Like having 4 generations around the campfire.
I also think it creeps up over the years :D