I just went through the insurance search, got three different quotes on full time insurance with no restriction on driving truck. Here is who I used:
Lazy Days Tampa, talk to Grace or Lillian. The supervisor also know how to do it. 866-316-3862
Miller Insurance in Oregon. Requires a picture of the truck. 503-636-6347
Clemens Insurance Agency in Kansas. You have to also have another car insured with them, used my Smart. 620-421-9999
Hope this helps.