I posted something similar to this about a week ago. My grey tank flush is under the slide out, so in order to drain the tank, I have to crawl underneath each time; a big pain in the rear. I received some good comments back. Try searching the Valterra website for extension handles and other gadgets that may be useful.
Mike & Stephanie Radar, & Mollie
TV 2015 Chevy 3500HD
TT 2015 Jay Flight 32BHDS