Tri axle dump as in 10 wheeler or 14 wheeler?
Most 10 wheelers are good for 45-50k, a 14 wheeler could be around that or a bit more. I don't think you'd legally sit at 80k.
None the less... lot of weight!
Some years back there was a farmer that drove through town. Had 2 full size John Deeres, I forget the model, but they were articulating tractors and duallie tires on all 4.
He had TWO of those loaded on a trailer, towing with a duallie Dodge 3500. No flags, no pilot cars, no overside (well over 10ft wide). I was eating lunch at MacDonald's and I hear a diesel working HARD. I looked over to see and I saw that whole crapstorm pulling away from the stoplight. He was headed North which mean 10-14% grades, roads with lanes barely 10ft wide, no shoulder, mountain cliffs, with minimal guardrails, etc.... I hate driving that section even in my car!