Good input from you both. To help with future readers, I went all the way back to my original post and clarified in my opening paragraph by putting the series in parenthesis after the category: Heavy Duty pickup (2500 and 3500 series). Fullsize pickups (1500 series).
Would love if Toyota made an HD Tundra, even if it was a 'tweener like the Nissan Titan XD which is half way between Fullsize capability and HD capability. Nissan already dropped the diesel engine for the XD. According to Nissan, the Titan and Titan XD have the exact same frame, but the XD has "commercial grade components". They do not specify what those are. Looking at the chassis with body off, I only see a few extra crossmembers. They don't specify that there are bigger/better brakes, etc. Mainly heavier suspension as far as I can tell.
Back 20 years ago, when 1/2 tons really only had 1/2 ton capacity (1,000 lbs), there were occasionally brands that came out with "heavy half tons" with more payload capacity, sometimes different engine options, better brakes, etc. But today's fullsize already have payload capacity that exceeds that of the 2500 from that period.
If I had to piece together my dream truck, it would basically be a modern 2500 chassis with it's current brakes and suspension but a drivetrain from the Fullsize category. I don't need a huge V8 gas or V8 diesel nor a HD transmission because I'm not towing 14,000+ lb. I just need the HD payload capacity to support a pop-up slide-in camper and my gear and I'm only towing 2,000 - 3,500 lb trailers. I would prefer a small V8, a turbo V6, or a small light duty diesel in that big chassis. A small inline 6 diesel (like the Duramax 3.0) with 10 speed transmission in a 2500 chassis = my overlanding dream truck.
Would love if Toyota made an HD Tundra, even if it was a 'tweener like the Nissan Titan XD which is half way between Fullsize capability and HD capability. Nissan already dropped the diesel engine for the XD. According to Nissan, the Titan and Titan XD have the exact same frame, but the XD has "commercial grade components". They do not specify what those are. Looking at the chassis with body off, I only see a few extra crossmembers. They don't specify that there are bigger/better brakes, etc. Mainly heavier suspension as far as I can tell.
Back 20 years ago, when 1/2 tons really only had 1/2 ton capacity (1,000 lbs), there were occasionally brands that came out with "heavy half tons" with more payload capacity, sometimes different engine options, better brakes, etc. But today's fullsize already have payload capacity that exceeds that of the 2500 from that period.
If I had to piece together my dream truck, it would basically be a modern 2500 chassis with it's current brakes and suspension but a drivetrain from the Fullsize category. I don't need a huge V8 gas or V8 diesel nor a HD transmission because I'm not towing 14,000+ lb. I just need the HD payload capacity to support a pop-up slide-in camper and my gear and I'm only towing 2,000 - 3,500 lb trailers. I would prefer a small V8, a turbo V6, or a small light duty diesel in that big chassis. A small inline 6 diesel (like the Duramax 3.0) with 10 speed transmission in a 2500 chassis = my overlanding dream truck.