Make sure your replacement cost coverage is realistic, and look into what provisions are included, if any, to compensate for changes in code. My mother is in the process of rebuilding after a fire, and that is the most valuable thing she had as part of her policy - an optional rider (at additional cost) that specifically covers the difference between replacement and current code. Since her town has "gone green" and mandates a LOT more in terms of insulation, energy conservation, and water conservation than when her home was built in the 50s, a basic replacement value policy would have left her with about 25K to come up with for the code improvements.
Personally, I was more comfortable using a local agent that came out and gave me a detailed replacement value than I was with any of the national chains that were willing to determine the RV sight unseen. I was a bit shocked at what they determined replacement cost to be, but it wasn't that far out of line with other quotes I got for comparison's sake and was done with an accurate knowledge of our fairly unique home.