No real benefit to the diesel classes -- no turbo tech or real classification, stock class is still 15mph limited crap, no 2wd consideration, still have 15 or more gas classes and 2 diesel classes.
Curtis and I can pull with 30" hitch height in the 6000lb 2wd open truck classs. Just need a Rockwell and some 18.1 x 16.4 Dick Cepek pulling tires (shouldn't be much above $8500 for the swap)