Looking at the Code 3 workshop pics, which are shot dead-on front and rear, it looks like the back set are clearly duals (or at least double-thickness of the front!)

mjl

Well, I guess we'll just have to wait for someone to get one and verify for us one way or the other......Later Dudes...

No need to panic guys....she has correct dual rear tires! The tires on this particular mold have always been thin, so its the photography that is creating the illusion and not what's actually on the model.

Location: Meriden, CT

Take a look at the closeup photos. The tires are correct:

http://fireengines.net/code3e201/