Length of torklift supertruss with Arctic Fox 992?

There are a few considerations, not the least of which is not wanting to have to much extension length. Only serves to add even more weight to the back of the truck.

Depends on trailer type as mentioned also, and weight of trailer. Do you need a super truss or is a solid bar extension sufficient?
Factory hitches are already good for 2000 lbs iirc tongue weight. Reduce for extension length, but you can haul a significant load without a super truss.
Food for thought