ASSUMING THE FOLLOWING VALUES ARE CORRECT:
truck by itself, no wdh attachd
front axle-
3200# assuming 40# would be removed by extra "tongue weight" due to 100# WDH
gross tv-
6340# assuming 100# would be added by the 100# WDH
rear axle-
3140# assuming 140# would be added by extra "tongue weight" due to 100# WDH
truck hitched but bars NOT engaged
front axle- 2940
tt & tv- 12300
trailer -5360
rear axle-
4000# using tt&tv = 12300
THE TRAILER WEIGHT WOULD BE: 12300-6340 = 5960#
That value seems rather low given the dry weight of 5840#.
Was the trailer essentially empty when you weighed it?
Ron