The heaviest truck I've ever driven was an overloaded Van Wyk Volvo or KW T-660 (I don't remember) that I took from Chicago to the big Menards DC a few miles east of Omaha.
Listening to the engine moaning out it's one note song, yada yada, etc
It was a load of shingles I picked up.
Not only was it way over gross, they loaded it in two separate groups of pallets with nothing in the middle because they were used to loading flatbeds with a frame. No idea why they agreed to load a reefer. No idea why I decided to pull it. I guess I figured, well if I don't use the brakes, I'll be fine.
I scaled it somewhere and my gross was 91,000 or so. As I remember it after all these years..
I took 90 out to Rockford and took US 20 across most of Iowa, then 2-laned it down to I-80 to avoid the scales south of Storm Lake. It added miles and time vs I-88 to the quad cities and 80 the rest of the way. But I would have wasted even more time had I gone back & made them cut the shipment by approximately one fifth.
The truck wasn't that much different on the Illinois section of US 20 where it's hilly just like most of Pennsylvania. It had enough power I probably coulda had another 10k, but the Jake brake wasn't much help on the down-grades and I had to do the whole "mountain braking" thing a lot though. No big deal because I was running Sandstone in WV almost once a week at the time.
But otherwise,... meh..
Just dodge the scales.