Composting Toilet- Shower- Grey tank ?'s

[Monza]

Hey
Doing some planning for my 73' tradewind redo. (full monty starting soon- like today)

Going with a composting toilet that I was planning on putting on the old black tank that rises above the floor in the rear bathroom. Plans to convert the black tank into a grey water tank. (trailer has no grey water as per original trailers of those years)

My question is the shower and a p-trap. Do I need to raise the shower even higher then the converted grey tank to incorporate a p-trap in the shower? I can't see that being practical stepping up into the shower, and obviously losing that head room in the shower.

Any help, thoughts or guidance on this please? I could use a smaller grey tank mounted below floor in the same location, but the larger converted black/grey tank in original location sort of makes sense to me.

[Williker]

As long as the pipe has enough pitch going to the tank, your okay. The bottom of the trap may well be below the inlet to the tank but if your waste line is only 1 foot from the tank the exit of the trap only needs 1/4 inch per foot for proper drainage.