FWIW I run a Ram 3500 SRW megacab with the H.O Cummins for family hauling, camping, towing moto bikes around, moving equipment, etc. It has Thuren suspension up front, factor air assist in the back, and 37" tires on 17" wheels. It rides like a dream, gets 20mpg in empty highway cruising, has huge interior legroom and width (3x carseats are no problem in the back), and can tow/haul almost anything. It suits our purposes really well. The ride on modern 1-tons is really pretty decent, and if you bolt on Thuren or Carli goodies it's downright luxurious. It's genuinely not far behind the LR4 at all (and the Rover has killer air suspension). 37s fit without lifting it and are also an important component in the good ride. Don't believe people who say you don't need to re-gear. Can you drive around without re-gearing? Yes. Does it suck and torture the transmission, yes. I re-geared and used that as a good excuse to toss an ARB air locker at it at the same time.
The wife's DD is a LR4 and I have a commuter car for going to work and such. I wouldn't personally be inclined to use a HD diesel for a DD. If the wife wanted a full size to DD it'd likely be a half ton pickup, or 'burb, expedition, Wagoneer, etc. Big diesels are, well, big and kinda clunky for DD use. These things weigh 8500-9k lbs empty and are tall and long. Mine doesn't fit in many parking garages either.