Our 23D corner bedroom went across the CAT scales at 5120, reasonably loaded for 2 weeks camping in Oregon, included 1/4 tank of water. The tongue weight on the Sherline scale was 780. (since added 3 solar panels, heavier 6 volt batteries, and a bike rack/bikes....65+30+80.)
We pull the 2014 23D with a 2013 RAM 1500
with shell. We use a simple Husky WD system/sway control with 800 lb bars, and AirLift 1000 air bags @ 20lbs (of 35 max). 11.5-12.5 mpg. The 23D has 15 inch Michelins now.....much better ride and control and higher clearance.