Looking for insurance coverage of TV if I rent it out

You will need a commercial policy that covers ALL drivers on rented/owned vehicles. It will need to be endorsed for the purpose of rental use. In FL, you're require to carry higher levels of accident/medical/damage coverages. The policy will cost you twice as much as a normal consumer policy, especially because of the GVWR of the subject truck. Unless you rent it out several times a year, you likely will not recoup the cost of insurance and maintanence.