Banks Turbo?

Ok guys it is almost time for a turbo. My truck is a 1990 F-250 N/A 7.3 5spd 4x4 132,000 with 3.55 gear. I installed a rebuilt injection pump at 100,000 and I installed a Luk single mass conversion just a few miles ago. My question is, how much of a difference does the turbo add to my truck realistically? Pulling my chevelle or jeep on the car trailer it does ok, but when I pull my 32' gooseneck it is a load on the truck here in the foothills of SC. I am considering adding the Banks kit and I am also wanting to know where is the best place and price to get the kit from? Thanks!