Well...I'll tone it down a little. You will be overweight...way overweight...but understand you have to work with what you have!
#1 Insurance on the TC and truck (obvious...but I don't see how this will help you haul better?!)
#2 Tires/wheels...E rated
#3 Airbags or supersprings. I have both. Skip the bags...go right to SS.
#4 Sway Bar if necessary after doing #3.
BTW; you will not be the only one overweight here. One rule you should NOT violate is the tires/wheels.
Good luck, others are doing what you are...be smart and you will be OK.
Don't be surprised if you are shopping HD trucks in a couple of months...
Bill