Since when does redneck = Chevy lover? Plenty of rednecks around these parts, and I'm pretty sure more than one has been killed for suggesting that Chevy ever did anything better than Ford to another one on the wrong day. Plenty of Dodge love too. Just don't let them near a furrin car.
On Camaros, yeah pretty much any old beat up one kinda screams redneck(no more so than a Mustang), but in good condition they're perfectly fine cars. The IROC might say "80s" but not so much redneck. I agree with CDJW on it: a redneck-mobile really needs things like stupid mods, mismatched wheels, some bondo and lots of stickers - 3s, 24s, 88s among them if possible.
BTW, as I said, plenty of 'necks around me, some drive camaros or 'stangs, plenty drive sedans but the overwhelming majority drive trucks. Quite a few mullets too, but I don't think I've ever driven past a mullet in a Camaro.
My choice has to be a jacked-up Ram. Might be new but it's one rednecks would love to have, unlike the other trucks.