Got a Mack B dump and cement mixer this weekend. They look nice, though someone said they are smaller than scale - I havent pulled out the scale rule yet.
I bought mine in minimal schemes (why don't they offer these without lettering?) thinking it will be simple to remove the lettering with some rubbing alcohol - haven't tried that yet though.
Every wheel on mine has a bump where the wheel was separated from the sprue - I will have to get an exacto knife out and trim each of the wheels. :

One problem seemingly on all the dump trucks in the store (even more so on the Mack R dumps) was that on many of them the cab seems to "angle upwards" compare to the rest of the truck. After unwrapping mine I was able to delicately "bend" it back to level.

(Crappy QC)
One question for the truckers: is the large "hump" in the front of the dump "bed" prototypical? (see pic below):
http://www.featherrivertrains.com