You have not said what motors, transmission, axle ratings front and rear, cab style that I can tell! Reality is imho, your wasting people's times. MDTs you don't just walk in and buy a truck like a LDT! Any given model can have one to four plus rear axle ratings, 2 or so front, multiple tire size diam options, which the rear axle ratio is based on. I had one auto, 4 manual transmission options. I have an IDI 7.3, 3 HP/torque options. If I would have looked at the DT466, a couple dozen options from 160-400+HP. Torque into the mid 1500-1600 range.
With that in mind, my ref cab with a 188" wb, 14' flatbed dump is 11,800 empty. No bed was in the mid 8000 lb realm.
So knowing what little I know about MDTs, I would choose none of the above! Until I had more info to work with.
Reality tells me, the IHC will ultimately, be the better one, especially, if you want a 4x4 factory stock. If you don't want a 4x4, ride height step in is a BIGGER factor than you are making it. An IHC lo-pro in rwd, will make it so you have one step in, bed height lower than a cab and chassis 35 series......assuming you go with 19.5 tires.
Also, do not see where you are located, by factory gvwr if in Wa St means squat. Your tonnage is empty weight times 1.5 to next higher ton. My IHC is licensed at 26000, 18,000 gvwr, been pulled over and weighed at 2700", no over weight ticket. As I was under the federal bridge law axle weight limits. Just had to go buy an extra 2000 lbs of gvw from DOL until current license expired 2 months later. Max gcw! Again is based on tire width, axle quantity etc. Those numbers your worried about, mean squat!
You can put bigger heavier ties, springs, drop axle, increase gvw, ihc, won't give a rip!
Marty