The problem is that the name is simply CHGR_TEMPLATE
So yeah,it won't probably work. If the name is like the one you said,it would be easy(i'm not new to modding)
So far I've seen only one Highway Patrol Charger which is this one:
http://www.gta4-mods.com/vehicles/lcpd-hwp-chgr-v26v-f10054
This one sadly has no multiple liveries option. Any other Highway Patrol Chargers?
YES :D
It's actually here on this site. BravoZero was kind enough to made 2 versions of it. One with steelies and the other with hubcaps.
Here's the link: '?do=embed' frameborder='0' data-embedContent>>