Agreed about the one up numbers stuff both in the HDs with HP & TQ and 1/2 tons in towing capacity. Although I see bigger semi type loads going down the truck routes on as big as a 50' triple tandem axle GN flatbed behind a dually. The fuel economy wars I'm actually good with up to the point where it cuts into as said drive-ability reliability etc. Who doesnt like a full size 4WD truck that gets 30 mpg hwy. I doubt Ford & GM 3.0 diesels will have cooling issues that had more to do with the limitations of the electric fan and Ram's stupid packaging by covering the radiator with an intercooler and well a restrictive grill. The second gen should have this rectified but we will see.
Towing a grade with a heavy boat or TT in my truck is almost always done at 55 mph IE 5th gear keeping it down to 3k rpms so that it will not derate. But I do have 3.92, a tune, factory honeycomb grill, and run a 31.9" tire. Its done a 9k TT 1,000 miles down the 5 from Oregon to LA over the 5 & 6 percent grades of Mt Shasta & up the grapevine into LA. 55 on the grades 65 on the flats with good WDH built in sway control and good axle and tongue weights. It did well but 8k is more of a practical max for even a proper specked 1/2 ton regardless of astronomical tow ratings. I believe I could actually benefit from 300HP 500TQ towing an 8k TT with a 1/2 ton but thats pretty much fully using the practical limits of the 1/2 ton platform. And that should be fast enough for anyone with any common sense to move a practical limit load with a 1/2 ton. Yeah the whole I want to tow 10k in the hammer lane up a grade leading the charge with my 1/2 ton is foolish abuse of equipment as its well into HD territory regardless of advertised ratings.
fwiw T-stat fully opens at 224 fans kick on 226-228 computer can start stepping in fuel de-rate at 245 also above 266 oil. Full synthetic oils have no problems with these temps. BTW we are contracted with 4 Mfgs and transport TTs & boats. My lil econo diesel recently turned 500,000 miles. And can you do this with the 5.7 Hemi yeah but the fuel costs would a lot higher ie less profitable and the longevity under that workload would be suspect. Gas 1/2 tons are the right choice for most people. The ED is for a target 5 to maybe 10 percent of 1500s sales IE always to be a supplemental choice engine to complete the lineup. Doesn't mean we can't love it.