box truck

Hello all. I'm new to the forum and am planning a box truck build. I'm starting this thread with the idea of continuing it later, but right now we're just shopping for the right truck and doing research and planning. I wanted to start with a topic that I'm hoping some veterans or mechanically...

I'm not sure how to think about grey and black water tanks for my box truck conversion. Does anyone know any good sites for how to install them? I haven't chosen my toilet yet... if it's a composting toilet then I may not need a black water tank at all, which is preferable.

1991 Ford F60 Man Cave