It doesn,t matter what engine you have really besides MPG,The gear ratio in the rear end / transmission determines How much weight you can pull.We have an 1981 6cyl which we drove East Coast to west and back again.1st trip we pulled a fully self contained trailer,then pulled a boat locally to the Lakes & mountain KOA's..Then converted it into a transportation bus for local sight seeing buisness.
I,d switch to the 6cylinder,if it was mine.
~Just take care of it and it will take care of you~