LP gas Diagram, help needed.

You will need a integral two stage regulator, It required by code in the US and I assume up north. It takes tank pressure and reduces it to to 10 psi in the 1st stage then 11" WC (6.35oz) in the second. I assume that your tank was mounted correctly meaning proper orientation. (top up) you will need to pipe the relief valve to the outside of the body so it doesn't impinge on anything, you will also need a rain cap for it.As stated early using an un vented gas heater with and oxygen depletion sensor will work BUT you must supply fresh air and get rid of the moisture produced or you will have lots of mold/mildew and sagging interior body panels. You can use your little grill but you will need to tee into the tank ahead of the regulator.