Lose the dots dude. NO ONE will read your threads if you leave them hacked up like that with all the gibberish.
I think you're asking if towing heavy puts more stress on your engine than a leisurely sunday drive, if so yes. Definitely.
Running an engine at peak output is ALWAYS harder on it than an empty load. Question is: how much is too much right?
I can tell you I've towed up to 24,000 GCWR
and ran whatever speed I wanted, flogged it hard on the hills, done numerous foot to floor boosted launch street races (a lot), several sled pulls, and a handful of drag strip passes and I have yet to hurt my engine.
You can extrapolate torque from HP if you know at what RPM that HP was made, but that won't tell you what PEAK
torque was unless you redo the whole graph, not a quick or easy process.
My suggestion to you, copy my setup and hope it lives. I'd say it will, but no one would gaurantee it.
Good, cylinder pressure tested tuning, and small (read stock) nozzles are the key in my opinion.
Let's compare Kainers vs Mad_matt as examples. I know both these guys and they're cool, I'm just making a point.
OK, Kainers, 434HP on a stingy dyno, beats the piss out of it everyday, almost 300K miles, still living and doing great.
mad_matt, 412 HP, blew up weeks after installing injectors and big oil.
.0075 Extrude Hone nozzles (flow a lot)
Take it or leave it, but that's my theory. Keep the nozzle size down, ICP
up to burn the fuel, and don't get greedy.
If you got enough money to make 450+ HP in a powerstroke, you got enough money to pull it down and do rods, and vice versa.
Hope that helps