You haven't mentioned what insurance company you have, for reference. We were with State Farm for roughly 10 years and over time the rates slowly crept up for no apparent reason. I finally got fed up towards the end of 2017 and switched to Progressive (I had them before and was happy with their service but State Farm ended up having lower premiums when we switched to them), our premiums dropped a crazy amount for the same coverage. In fact, our premiums dropped at of the most recent renewal period. State Farm never did that, only raised rates.Currently paying $700/yr for my Denali, FWIW. Like credit scores and location, which do impact rates, everyone is different so can't really compare but it definitely sounds like your insurance company/underwriters screwed up.
My agent is an independant agaent, just means they have a list of insurance companies to shop around with. Autos and home are with Republic. Boat and ATV is with Progressive. I asked my agent today to either sort the issue out or shop it around. Not a huge deal, just seemed really odd that it came in at double the other colorado, and it's even $300 higher then then an $80k+ 2018 Land Cruiser. All in all just doesnt seem to be adding up. With everyone else here reporting their ZR2 rates were pretty normal and even less then other vehicles they own. Like you said I think this just has to be some sort of screwup with underwriting.
2019 Colorado Dmax 4x4 White ZR2 Bison
Same wheel and tire combo as the 2016 .
More Mods to come.
2016 Colorado Dmax 4x4 White LT
Icon Stage V Suspension , 1" rear lift blocks, Fuel Black Anza 18x8 Rims, Cooper Zeon LTZ AT 285/60/18 tires, Duramax Tuner tune and Trans tune, Black bow ties, Black OEM fender flairs, lighted headache rack, and rails ,Westin tool box
2018 Toyota Land Cruiser
2018 Silverado 1500 LTZ 6.2L 4x4.
2015 RAM 2500 4x4 CTD Laramie