The trailer shows a 7495 GVWR = 1875 lbs per tire....
Dry weight says around 6265 = 1560 lbs per tire....
This = around 1200 lbs of CCC so most likely the trailer will weigh close to its 7495 lb max gvwr.
The Endurance ST 205/75-15 load D at 65 psi and a 2175 lb load capacity will give the trailer a nice 15% load reserve capacity. ?
Some tire dealers have excellent experience with trailer wheels tech and tires tech (matching pressures/load capacities/proper width/etc).......others ??.
For this trailer I would stick with the OEM sizes/load ranges.
edit ....jim