Many CampChef stoves can be used via regulated low pressure.
CampChef makes a hose just for that http://www.campchef.com/rv-connection-hose.html
mbsturgis.com is a source for model 250 quick disconnects as well as http://www.gashosesandregulators.com/propanequickconnect.html
Generally there are 3 propane pressures, regulated low (less than 1 psi), regulated high (greater than 1 psi) and container pressure (unregulated, varies with temperature, 100 psi @ ~60F, 200psi @ 100F,60 psi @ 30F).
Most grills operate via regulated low pressure, a Coleman stove is regulated to 15 psi.
A big buddy heater has inputs for unregulated propane and regulated low pressure.