My second tank was intended for washer but we only use it for normal gray water by doing the simple equalizing method with the twist on shutoff. Also the tanks are heavy and by using two they can be placed better to equalize weight.
No man has a good enough memory to be a successful liar. Abraham Lincoln
2016 36FBTS Pinnacle
2016 F350, 6.7, 4x4, DRW, long bed
B & W Companion 5th wheel Hitch