It sounds like an error was made somewhere. I know insurance varies a lot based on state, personal info and history, credit record etc, but this still seems off.
We have a Blue sky FTers policy, with full replacement rather than depreciated value for the first 5 years, then original purchase price for the remaining years. And that's on a 2013 Excel and a 2008 F450. So even with these significantly higher insured values, our yearly premium is less than 1/2 of that quote.
2014 F350 Lariat
2013 Excel 36 RKM
Sir Reginald the cat who lets Big Mike and Jean travel with him