I just saw an episode of 'Emergency!' yesterday, and they had to use the JOL; as Chet hopped up on the squad to pull it out, he had it turned so HURST was quite visible. And you can tell, he purposefully turned it for that.
It's either a funeral flower car or an auxiliary hose car with the fire department, but I can't tell which, the roof is too indistinct. I'd like to say it has a gumball machine, but I just can't tell.