Here’s my issue.

My truck runs great until I’m pulling my 24k lbs 5th wheel up 6% grades at 60mph then the temp shoots to 230* not sure if it will go higher but that’s when I back out of it.

I will mention my egts never go over 1250* here’s my break down my trucks a bit modified.

I stay in the tow tune from DRD.

Also I am not losing coolant.

2015 RAM 3500 dually
BD Rumble B 364.5 second gen swap
Mishimoto radiator and inner cooler
Industrial Injection Performance fire ring head and 50hp injectors
Banks monster intake
ARP 625+ studs
4” exhaust with inline BD exhaust brake

Any thoughts will be appreciated