It doesn't take much to put a dent in a gravel box especially if you are hauling pit run. The only thing that doesn't damage a box is topsoil or bark mulch but even then all it takes is one careless loader operator and damage is done.
I bet that polished box cost more than a regular aluminum box that would fit a tandem axle (16'6").
Dump trucks are meant for work that extra chrome stuff doesn't get work done. I like aluminum wheels and the jockey boxes and the other cab adornmnents but the box is way too much shiney stuff.
To tell you the truth a International powered with a 466 would be the low powered spec'ed truck the same truck with 10litre power is better. The reason being is more power
plus you get a engine that has a JAKE and not a potato stuffed in the exhaust pipe (exhaust brake). I looked at the International website and you only can get a 7600 single axle with ISM power 320hp 1150 tq with a 13spd.
The single axle plow trucks I worked with had M-11 power (300hp) full jake lots of power it would make a 35,000lb truck scream down the road. The old Internationals with 466 power wouldn't even come close to the trucks with M-11 power all with 35,000lb gvws.
As I meantioned other times before most single axle trucks are lacking enough braking power even trucks with air lack brakes. A true Jake helps alot without one you really need to use the gears and pull the seat out of your *** when you go down a hill too fast
The Cummins L-10 M-11 were known for decent holding Jakes the 3306 Cat wasn't too bad. You know when a truck is L-10 or M-11 powered by the sound of the JAKE rapp its usually a higher pitched sound.
A truck like Dukes could have a L-10 under the hood the cab would probably require a dog house and the engine would sit half in the cab like a L-9000 Ford. A L-10 and 13spd in Dukes truck would make it one hell of a hauler being 4x4 plus it has the power to travel down the highway. He would beable to pull 7OD most of the time and go down hills with the JAKE on and maybe touch the brakes once.