Originally Posted by ronhuntfish
I guess I'm just curious if they are right over the axles, or mostly in front or behind¬*of the axle.¬* Right under the toilet would probably put it on the passenger side (same as fresh) so I would assume the gry is on the driver side?
The tanks run side-to-side between the I-beams, so the grey tank will either be forward or rear of the black tank, not beside it. A lot depends on the bath layout and if you have a single grey tank, then it should be on the kitchen side of the black tank, if that makes sense. Also, both tanks should have a vent pipe to the roof, so if you locate them, that will help as well.