Here is an example of a truck with the rear rims being white.
A 1993 Freightliner FL-70 with bodywork by E-One. It has a 1500 GPM pump and a 500 gallon water tank. Sirens include two siren speakers and a B&M Super Chief siren mounted in the bumper. It carries a length of hard suction, a ground ladder(both no shown), basic engine-company equipment, BLS gear and an AED.
I apologize for the LDD screenshots, but I currently do not have a camera.
*Credit for the cab, the pump, the scene light on the pump, and the scenelights on the rear goes to Zak O.