It's hard to avoid the temptation to demonstrate how a real truck engine pulls the grades to the GM/Ferd owners sometimes.
You brought back a memory. I have a story to tell about Homestake Pass. I was pulling a heavy trailer one morning for Horizon Transport before daylight when I hit the westbound base of that pass in a heavy snowfall. The caution lights were flashing and it was still very dark so I U-turned and returned to the truckstop on the south side several miles back. A big truck driver in the lounge asked me where I was going and I told him and also told him I was scared of that snowcovered pass. He was pulling a loaded flatbed @76k pounds and told me to follow him when it got light and he would show me how it was done. I agreed and when it got light he said, "okay, let's go. " I followed him.
He got half way up the east side and the snow on the highway was increasing. He called me on the CB radio to tell me he was locking his differentials then 1/2 mile farther up he called me and said he was losing traction and stopping to chain up. Here I was in a little Dodge dually and no chains with white knuckles. I didn't know what else to do so I told him farewell and pulled out into the slush lane and started around him as carefully as I could drive. I could have kept a fresh egg under my accelerator pedal I was pressing it so carefully. I made it over the grade with very little wheelspin or slipping and sliding with only a good set of Michelin highway treads and 2wd. As I started down the west side I passed a big truck that had jacknifed in the ditch on the right side. It was a scary morning and one of the events I'll never forget.