Gearing, heat dissipation, and other from high torque load applications

[Hammerhead]

I didn't wanna muck up or derail the SOI thread, so I started this one...

(01-24-2017 )AussieISX Wrote:  ... I have trucks running in the north of Australia pulling 167,000 kg ( 368000lbs) on 24hr operations using the same timing I suggested. Those trucks are not owner driven and have been running this tune for nearly 2.5 years without any cracked Pistons or any problems outside of normal issues.

AussieISX, I am a heavy equipment hauler here in NA, but I don't get as heavy as you've stated in this clip above.
Can you please tell me what type of gearing you guys use to move this amount of GVW?
Transmission, Auxiliary Trans, Rear Ends (single or two speed) and ratios.
I'm genuinely interested in how you get something like that moving, and keeping it moving. I assume once this is rolling, you don't stop frequently.
What kind of speeds does something like this travel?
Distances traversed?
Grades and grade lengths encountered and such?
What model of tractor?
What square dimension and fluid capacity of radiator do you use/require?

I move upwards of 85-90 tonnes (yes metric, I'm Canadian) 2500-4000kms across varying terrain. As much as 12% grades, 6-8 is more typical, but I occasionally see up to 18% in mines, but that's it's own animal.
I'm very interested in comparing how you guys do this compared to us over here. I have friends that move way more GVW than I do, but that's usually done with multiple trucks with platform trailers. Most of them run planetary rearends.