We have a Silverado 36TB on order - should be here in about 2 more weeks. Since this unit has two black holding tanks, we have decided to get all new sewer lines. I've been looking into get all new RhinoFlex but I'm having a hard time finding out how far apart the lines are under the unit. Does anyone know? I would assume one is in the middle and the other is towards the back, past the axle? Thanks in advance for any help!