Well i really know about tri axles i drove them for about 3 1/2-4 years and my dad been a O/O for over 30 years. I live in PA and we don't run quads here. But that type of truck with them miles in a tri axle i think would go around 50k give or take few bucks.

The out fit I work for runs 10 tri axle Macks but we have been looking to add a few quads because we haul 18 tons with a tri but with quad we can haul 21.6 to 22.5 tons depending on how we spec it.

All late model quads around here have been in the $62,000 to $90,000 range.

in PA a tri axle can gross 73,280 i know of a company alumatech That makes a body with the right specd mack can get a 26 ton payload. my old mans pete with a steel body can haul 23 tons.