Single tank set up

Forgive me if this has been asked numerous times, but I can't seem to find a clear answer.
I have a 20 lb propane tank mounted on the tongue. I want to run a ridged pipe back maybe about 6 ft under the trailer then up through the floor to a valve and short flexible hose to a stove. The stove is unregulated and needs 11"WC pressure. What kind of regulator do I need at the tank, single or double stage? Thanks!
edited to show 11"WC not lbs.
I have a 20 lb propane tank mounted on the tongue. I want to run a ridged pipe back maybe about 6 ft under the trailer then up through the floor to a valve and short flexible hose to a stove. The stove is unregulated and needs 11"WC pressure. What kind of regulator do I need at the tank, single or double stage? Thanks!
edited to show 11"WC not lbs.