If you look under the trailer you will find the drain port is in the center-front of the tank. Along with the shape of the tank making that the low point when the trailer is level.
When I dump I frequently use my Lynx blocks to get level before I dump.
Chuck - Sparta, TN
2012 Jay Flight 22FB, 2 x Honda EU2000i
2013 GMC Yukon XL Denali AWD
EDUCATION is what you get when you read the fine print.....
EXPERIENCE is what you get when you don't.