We domicile in SD.
We have had National Interstate on the truck and trailer for over ten years. Full replacement on the trailer. Use to have it on the truck, but the price went up to high on it do to its age on full replacement. We dropped that on the truck and it's even below what it was before the raise. Have had a two claims. Taken care of right away.
Now the car was on National Interstate that went up too. Switched to Progressive and have been very happy with them. Have had some glass chips on the windshield from flying rocks and those were filled, no deductible on glass.
EDIT: One other thing if we change companies on the truck and trailer we will lose the total replacement on the trailer.
I do agree with Tech Writer. Get an umbrella policy.