Chris, might also try "Young" we had several in the two departments I was with. Most were Ford "C" cabs with a canopy added for the jump seats (transverse).
One was a straight "C" with a 55' tele-sqirt ladder. The sqirt was about as stock a cab as you could get, automatic transmission and only two seats up front. Looking back (80's) we had a rule, if there were only 3 guys, either 2 guys had to ride the back step (driver alone in the cab) OR, the third guy would have to ride up front (sitting on the doghouse...all in the interest of safety....ah, simpler times
I will try to hide seams and such with paint schemes and accent stripes. I the case of the Freightliner, I did that on the sides and hid the roof seam with a drag foiler (oooh, that might be a GMC term...lol).