Truck Camper Insurance

In my location American Family has been the most competitive for my vehicles and home, however they would not insure the TC. I went to Farmers to insure my F350 and the TC. I furnished all the initial new purchase cost info and it is insured, with comp and collision under their J6477 Trailer, Travel Trailer or Camper Endorsement for ACV less a $250 deductible for a 6 mo. premium of $193.60. The comp and collision covers damage to the TC whether on the truck or off. My single biggest concern is that the insurance company's ACV determination in case of a TC claim will be far far apart from reflecting its pre-accident condition and my view of depreciation. I would like to consider replacement cost coverage on a policy independent of the vehicle (although liability should it fall off the truck would be covered by the truck per my agent).