All the adjusters I have worked with were actually independents who adjusted for several insurance companies. They also always found more damage than I ever saw. They always put in a clause which allowed for increasing funds for repair if more damage was found once the repair was started.
We had a five year old Terry fifth wheel with the tin panels instead of fiberglass.
It was totalled. Not only was the tin siding damaged, but the entire roof foundation needed replacing. You could feel golf ball size dents in the plywood underneath the rubber covering.
We bought the RV back from the insurance company with a salvage title and used it for another year or so, then sold it to a farm as a security shack (cash deal). Worked out well for us financially

Hope yours can be repaired, but if not, it's not the worst thing that could happen
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Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD 4dr short bed Duramax w/allison
Reese Fifth Airborne air ride king pin coupler with Sidewinder