Since they kind of look like an H1, I was thinking of replacing my H1 and F350 with one of these. They are pricey and hold their value but the biggest problem is they are not a horsepower king. They us a very similar version of the 6.0 Powerstroke found in the pickups and have a lower hp rating but maybe more torque IIRC. For towing a large trailer, you want at least 375 to 400 hp (like a new Superduty or Duramax) so you can climb hills easily while towing and not hold up traffic. They are very heavy and the 40" tires sap the power, even with the lower gearing.
Regarding the ride, they can be softened up with new leaf springs from Deaver Spring and one guy in SoCal put air ride all around. The owner of a shop called Outlaw Offroad has one...you might want to call them since they've modified units with King Shocks, etc.
Overall, if they had a 400 hp motor with a trans to match, it would be a cool truck.
Cheers,
George