This sounds like a problem in the cooling system, not a normal condition.
The last time at Paragon we had all been spashing through mud for days and the trucks were completely coated. I know that my radiator had lots of crap in it. We were running a long crawler of a trail and it was HOT
(see pic below) and the truck never got to the H. Both HIHUMMER and I were on the same trail and noticed the same conditions.
It sounds like your dealer isn't trying hard enough to figure out what the issue is.
It was a wee bit warm...
