My truck is indirect injected with close to 22:1 compression, with a turbo. 1,200 would probably destroy it. I drive by the EGT and try to keep it under 1,000. Banks, who built the turbo kit, says 1,100 is the limit. During the winter this kind of load is no problem. It was mid 90s yesterday and I had to keep it at around 62mph to stay under 1,000. With the empty trailer on the way home, I ran 75 and it stayed between 900 and 1,000. This truck has lots of power, much more than the 7.3 Powerstroke in my van--you just can't always use it.
Here's what I was hauling--my Deere MC with a dozer kit. I bought a track loader a few weeks ago up in Chicago so I no longer needed the crawler to rescue my wheeled loader from the swamp. I sold this yesterday to a guy who is going to restore it. I commonly pull 10,000+ because my trailer weighs 6,000 empty, but normally it's around the county and not on the interstate. I don't care if the truck blows up a few miles from home because I have 2 spare engines. I just don't want it to strand me somewhere far away. So that's why I drive by EGT when I have to do a longer trip.