I have used Hagerty for six years and have been pleased. They allowed me to insure my trucks while I was restoring them (at an agreed upon price, after I sent them photos). As I moved along in the restoration, I increased the insured value.
However, once my 2-ton COE with flatbed is restored, I will be looking for another insurer because Hagerty will not let me use the COE to carry one of my other trucks to a truck show.