I have started a periodic spraying of all the under chassis components with FLEX SEAL clear spray, I spray all the edge trim exposed edges, frame un coated surfaces, wood edges and chassis parts. I stay away from the brakes, lining, cables.
I have started coating all the exposed connectors under the RV. I put a light coating of sealant on all fuse and battery terminal exposed cable connections.
Around the door step area are exposed wood edges, these can accumulate water, when frozen this will tend to split and rot.