If you have trouble climbing the ladder, why not get someone else to wash & wax the roof for you? Pay a young man to do it for you; save your back! Ditto for troubleshooting a blocked drain line. Ask Tiffin for the exact location of the underbelly drains. Inspect the duck-bill fitting at the discharge end to see if it's clogged.Also... you just might be able to "blow-out" the line from underneath with a short blast of compressed air.