I think Im the only guy in the world who'd see an Xmod of a police car or tow truck or something and think it was neat..anyhow when I decided to make my first project an emergency vehicle Xmod(with functioning visible warning devices that can be turned on/off) I spent hours looking for webpages online where I might be able to order or get information about
a)a good plastic 1:24 model of a Crown Vic or Caprice(to use as a police car) or an Econoline van(to make an ambulance with my actual company's insignias and markings on it). I've had alot of stuff happen at work and I havent been online much in the past couple weeks or touched my X-mod, so I thought I'd post a couple nifty pages that you might wanna look at for parts or information should you ever make an emergency vehicle Xmod. At first I wanted to keep all this info for myself but since I'm probably not gonna have the time to invest anytime soon I'd love to see some of the modelers here take a shot at it... There are alot of skilled modelers here and Im sure alot of you could pull it off...
anyhow here's a couple helpful pages:
this guy has alot of experience with plastic clip together models of police cars(was harder to find then you'd think...most of these websites have only die cast which are obviously too heavy for Xmods), i dont know if he's ever made one of these models for an RC car but if he did its not on his page
http://www.homestead.com/nells250/carmodels.html
this guys page is mostly useless as its based around die cast models, im linking to the index for things like decals, plastic push bars, a very good variety of emergency vehicle lightbars(so you probably wont end up using one you didnt like but was all you could find) it even has transparent paint you'd use to color a lightbar, and most of the parts are 1:24 or 1:26.
http://www.carorama.com/lgtbars/index.htm