The main reason for a cover is to keep running water out of the housing that could affect the electronics, and to keep the jack head from oxidizing. We ordered one from RV Tailors and are quite happy with it. Not waterproof, and it shouldn't be. Any moisture trapped under the cover can evaporate. It's made of Sunbrella outdoor fabric with a heavy duty seam and snap.
The main reason for a cover is to keep running water out of the housing that could affect the electronics, and to keep the jack head from oxidizing. We ordered one from RV Tailors and are quite happy with it. Not waterproof, and it shouldn't be. Any moisture trapped under the cover can evaporate. It's made of Sunbrella outdoor fabric with a heavy duty seam and snap.