a powerstroke 7.3 will pull real good. they wo't race into traffic like a race car but they pull good.
I have a 350 and 450 DRW.. I pull a GN deckover with BT trailer and have pulled my buddies e350 stretch conversion ( 16 passanger) van home from being broke down in georgia. the van was long enough that it was nosed up to the front frame and rear was just a couple feet off the beavertail. we ran interstate speed home with no problems on power. I got a big scoop on top of my 450 that was pulling that one. 4.88 rear end and 19.5" rims. I included a pic of the rig.
in short. I love those 7.3psd engines.. you will have no power problem..