Good O scale dump trucks?

Doesn't Spec Cast make a '60s era Mack dump truck?

Mark in Oregon 

Chris - look at either of these. The Dodge is from White Box, the Mack is a Franklin Mint model...

Chris,  If you have a 1960-1990 straight truck with a van body or tank body you could remove the cargo carrying portion and install a bashed dump truck body.  It would also work with a semi tractor, either remove the fifth wheel or fabricate the floor to allow for the fifth wheel.  With a little bit of weathering (ever seen a clean dump truck?) and applying the four feet rule you'd have a decent truck to fill your need.  Fabricated from plastic, it could be an empty truck looking for a load.  Formed from a piece of wood with cardstock used to extend the front, sides and gate a bit you could easily add a load of aggregate much like the loads of coal built for hopper cars. The silver truck is a K-Line trucks with cardstock used to extend the sides as is the one with the raised bed.  The bed was removed, a wedge placed on the frame and some rubber cement was applied.  At less than ten dollars per truck, a lot of play time.    

Bekins truck's cargo compartment at left margin is a piece of wood cut to size on a BB-157 chassis with cab.

Dry Ice truck in center of picture is a semi tractor with a block of wood for the insulated cargo compartment.  Decals from Atlas.  Looking forward to what you do.

John in Lansing, ILL

New  Ray makes modern 1/43 dump trucks,  I get mine at York dealers

This was my solution for 1950 era coal truck. 1949/1950 KW/PETE. A little large but priced right. Removed the fifth wheel from the tractor and crafted a dump bed out of styrene. One of these days I will get around to detailing them properly.

Thanks all for the suggestions.

I don't like the new ray stuff, they call it 1:43 but it is HUGE

New trucks are over 8' wide.  102"wide not counting mirrors. 

Found a 1/43 ertl, seems like that will be fit my bill