Same as above ⬆️
A friend put one in a 350 set up in a van for me, after seeing it done, I then bout 500l tank in frame, took it to dealership and asked them to fit tank to back of van for me, up against bulk head, enough room round back of tank to fit 2 pumps to bottom of bulk head, just there as I open side door run hose round back of tank through Di bottle, up frame onto roof into hose reel which is mounted upside down on roof.
I had a shelf fitted to side of tank for merlin to sit in and I will have a water port fitted to van soon, so after merlin hose will run along top of bulk head and through 2 small Di bottles which will be fitted to bill head.
This way I have kept more than half my floor space free and all wfp is fitted around top end