I would estimate the loads this way:
Set up 1:
Loaded TT 6750# with TW = 6750*0.13 = 878#
(assumes loaded TW is 13% of loaded TT weight)
Loaded TV(6400#) plus WDH(100#) plus TW(878#) minus 878*0.25 = 7158#
(assumes load equal to 25% of TW is shifted from TV to TT axles via WDH)
So GCW = TV(6400)+WDH(100)+TT(6750) = 13250 vs GCWR = 14000# (94.6%)
TVGVW = 7158 vs GVWR = 7200# (99.4%)
Set up 2:
Loaded TT 5800# with TW 5800*0.13 = 754#
Loaded TV(6400#) plus WDH(100#) plus TW(754#) minus 754*0.25 = 7066#
So GCW = TV(6400)+WDH(100)+TT(5800) = 12300 vs GCWR = 14000# (87.6%)
TVGVW = 7066# vs GVWR = 7200# (98.1%)
Obviously set up 2 is better, however love to hear people weigh in. How much difference would be noticeable while towing? Even though setup 1 is below limits, is it safe? Thanks again!
IMO, there is not enough TVGVW difference or GCW difference to say that one is better than the other on the basis of "safety".
However Setup 2 gives a TT to TW weight ratio of 5800/6400 = 0.906 versus the Setup 2 ratio of 6750/6400 = 1.05.
On this basis, the lighter TT might be considered safer.
Another factor to consider is how much unused cargo carrying capacity each TT has.
If the CCCs were similar, I would opt for the trailer which was better constructed and better suited my needs.
Ron