If I am going to be there less the 3-4 days, I hook up the sewer and leave the valves closed. If more than 3-4 days I do the same thing but open the shower grey tank until the last day, then close it to allow for a good flushing of the hose after all the black and kitchen grey water is out. If course if you need to dump in the interim, just do it but I leave the valves closed.
Plenty of water is a good thing.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
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