I later discovered that one grey tank was full and the other was 2/3 full. Also had a 225lb salesman sitting in the back seat of the truck.
Later weights, all water tanks empty, propane tanks full, fuel tank on tv full, Kay and I in the front seat are:
03 Duramax tv
TV
steer axle 4400
steer axle 3100
tv with trailer
steer axle 4340
drive axle 5120
trailer axle 9920
11880 trailer wt
2020 hitch pin wt.
17.00% hitch wt %
It's still heavier than specs, but not as much after draining all the tanks. Trailer weighed as it left the dealers lot, before we started loading in our stuff.