I'm really sorry if that was posted already, but tow truck has no rear wheels at all. Just a side note. 
 
Looks so good, really. Only thing that freeplay map is missing is park patrol, in my opinion. 
 
 
 
The tow truck is a known bug, not sure if a fix has been found yet or not. I believe it was a scaling issue, from memory.
 
I just opened the editor and open the childs on the tow truck and changed the wheels, it used the freightliner
wheels on the front and none on the rear. I found the topkick wheels and added them.
 
Anyway, there're two models of flatbed in game... Gives options. 
 
I don't remember having two available in-game.
 
Hey Xplorer, I noticed after I did the wheels on the topkick that the vehicle sat kind of low,
if I give them the proper clearance the wheels are partially below the ground. so I adjusted
them so that the rear wheels are past the wheel wells. In-game it doesn't look at all noticeable.
 
Norm,