So much depends on the state you are in and how the insurance companies view that particular state and the rates in that state.
Try going to this site: http://www.insure.com/car-insurance/car-insurance-rates.html
They have done exstenive research/testing on which states have the lowest rates and which companies have the lowest rates.
I pay just over $100 year for my insurance and it includes $3000 of personal property coverage for stuff in the trailer. This is very important because if you have two laptops, a TV and other electronics in the trailer when something happens most companies don't cover that or cover a lesser amount.
I have National General through GSE.