40 gallon grey water tank would be mounted under the chassis. Same technique would be used as in previous under chassis mounts. All thread and home brewed brackets to fasten to the floor. This time, I used three brackets made of 1"x1"x 1/8" wall tubing would be used to hold the tank.
The penetrations were made before the floor was in place.
Long story short:
The tank location would determine the location of my main drain line. I though a bit about that when I made the main drain penetration.
You can see the supply, and hot line from the water heater.
All the plumbing went together pretty quickly. If you've done home plumbing, this was no more difficult. Except, you're under a truck for waaaay too long.
Here it goes
Location (and water pump and expansion tank mounted):
Hot water lines under truck:
got my hand sink, three basin, and did the plumbing.
Here's how it turned out:
Simple check valve, found in your local box shop sump pump department
Hand sink plumbing:
Oh yeah, made a kick plate for the pump and expansion tank. All drainage is box shop materials. Easy stuff. Make sure you can service everything. It should all come apart without disassembling you're rig.