I would also suggest flushing the brake fluid. Brake fluid absorbs moisture from the air and when you use the brakes hard (downhill, traffic) the fluid gets warm and the moisture in it will boil. You will then have no brakes. If you survive this experience the one good thing about motorhome travel is that your clean underwear are close by. I usually flush mine every 2-3 years. One time having the brakes fail cured me of taking chances. New brake fluid has a boiling point of close to 500F. Old fluid has a boil point around 200F with moisture in it.
The solar cell on the roof is usually just an advertising feature that may keep the battery up during storage (only outdoors).
