I carry 47.5 gallons of water. 40 fresh, 6 water heater, 1.5 to charge the toilet. This is almost 400 pounds of personal stuff alone.
Last summer I loaded all the stuff I thought I would ever take for a week+ trip and weighed it. I did not weigh the tongue, but the axle on my 2720 weighed 3380 pounds.
Assuming my tongue weight is 15 percent (just a guess) then when FULLY loaded I weight about 3900 pounds axle plus tongue.
Some of my stuff is heavy:
2 folding tables
6 camping chairs
2 cases of cold beverages of my choice
milk and fruit juice
a well stocked bar in case friends stop by unexpectedly (where y'all been)
pots and pans
plastic plates, bowls, cups, glasses, etc.
paper plates, bowls, cups, glasses, etc. (not sure why we have both)
canned food
outdoor carpet
coleman stove
bbq
briquettes
hoses
games
as many vinyl table cloths as DW thinks is necessary to have
Stuff is heavy