It doesn't struggle at all on normal interstate roads. In the up side of the mountains of course it's going into the slow lane while the hot rod diesels go by. But that's cool, they paid $10K to win that race. My teams temps stay steady and cool, water temps go up a few degrees and engine oil temps cruise to about 250 and quickly drop back once you crest.
I've never concerned myself with winning a race up a mountain side, I'm happy that it cooling well and getting the job done in comfort. I know my old 7.3L PowerStroke F350 would never keep up with this thing!
It's a great truck and it works just fine. I pull excavators, very large track loaders, backhoes and dump trailers. The camper is one of the lighter things I pull.
Attached is a picture of my 14K gross dump that was so heavy that I had to spend a half hour with 2 men hand throwing asphalt before it could dump. The truck pulled it fine. I'm positive that the load and trailer were in the 18K area.
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