Silverfz,
For many years I towed with a half ton and was always near or slightly over the limit of the truck depending on what I was towing. The 1/2T's were mainly Chevy 1500 EC 4x4 reg box.
3 1/2 years ago I bought a new cabbed 4x4 tractor with loader and some 3 pt. attachments. That tractor put me over the limit of my 7K trailer and close to the 1/2T tow limit. I don't like to tow at or over the truck and trailer limits so I upgraded the truck to a Chevy 2500HD 4x4 CC regular bed with 6.0L and 6 spd auto. Trailer was upgraded to a 22' 14K tilt bed. Then I bought a 14K dump trailer and recently a 2010 Innsbruck 30' TT that runs about 9K or so loaded.
In reply to some of your questions I found the 2500HD ride quality to be almost equal to the 1/2T.
The 2500 has a slightly larger engine (6.0 vs 5.3).
Trans. is a 6 spd auto vs 4 spd. Gears are 4.10 vs 3.73.
BP Tow capacity is 14K vs 11,9K.
Downside is Truck MPG (empty) is currently 13.5 vs 16.5 for the 1/2T for local driving. I have seen 15.5 (3/4T) and 20 (1/2T) on long trips however, towing MPG on the 3/4T is better at 8.5-9 vs 6.5-7 on the 1/2T.
MPG on my 3/4T may or may not go up once it gets broke in. Only have 6K miles on the truck today.
Advantages of my 3/4T is bigger brakes (discs all around vs disk / drum) for better stopping power, Heavier duty suspension, higher capacity rated tires, higher tow cap. and better tow hitch, sits higher, better MPG towing.
I've had many friends ride with me and they commented on the ride quality and had no idea it was a 3/4T. I have owned or leased a few diesel 3/4T and MPG was definitely better towing and empty but for the added expense of repairs and fuel costs and the few miles I tow each year I couldn't justify keeping them.