HOW HEAVY HAVE YOU LOADED YOUR IDI ?
I don't know if you would really consider it a load; but, we regularly, as in doing it for a living, pulled a 28 X 8 (floor-length, before adding however long the neck is) gooseneck livestock trailer, loaded with usually fifteen cows averaging 1600-1800 each.
An average trip will run 500-miles one way, with it not at all unusual to go much farther; we frequently see the West slope of the Rockies.
The truck naked weighs 9800, give or take, according to which extra junk is in the various tool-boxes.
I never weighed the empty trailer.
Since the transplant, we use a 32-footer, with room for a couple more cows.
Understand that serious work like this is why we DEMAND genuine vacuum-over-hydraulic trailer-brakes and will not compromise with that
elect-draulic junk.