What clause in the policy is the insurance company using to take that position? If they do end up not paying they don't get the trailer to salvage.
Looking at your trailer and the panels that could be saved you might want to keep and eye out for the many trailers that show up with tree damage.
Might be a starting point.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles