Black/Grey Water

[StandUpGuy]

actually I am anticipating a problem. I am looking to drop down my shower pan to about even with the bottom of my trailer frame. If my intentions were to put a trap in the shower drain, I am afraid this will extend down too far to then tie in with the sewer drain stack.I would need the distance for the trap and then a 3 degree run to the main sewer stack. Granted the run would be about 26" but that is some additional distance. That would require a "Y" fiting and then whatever fitting is required to terminate the drain. I do not see how it is possible for me to have a drop down shower pan and connect with a trap. This may force me to need two tanks anyway.