I got a piece of schedule 40 sprinkler pipe, cut out a notch for the valve handle, basically and made a long handle extension. No more getting on one knee and no more elec and cables messing up. I used a dremel tool to carve it out. Also changed out plastic handles for alum and put lock tight on screw connections.
I looked for pic's but this article explains it better than I.
http://www.loveyourrv.com/tip-for-hard-to-reach-rv-waste-valve/
2003 Majestic 23P... Northwest travel machine
2013 Arctic Fox 25W... Wife "doll house" for longer snowbird trips
2001 "The Mighty Dodge"... tow vehicle for "doll house"