The PO of my van put one on. T'd into the main line under the sink. Very
easy mod. The line runs from the T over to the cabinet face below and right
of that door, facing the cabin/slider door. All you do is plug the QR male
from your cooking device outside, into the female QR at the cabinet face.
Nice part of this is that most of us would use the slider door side of the
van for that kind of thing, rather than the driver side, which is where the
main tank is. He put it in to run a propane radiant heater to take the chill
off cold mornings. Almost any propane supplier could fabricate the rubber
hose and QR end for you. Any length you want.

bob

>  There are quick release connectors for propane too.  You could make up a
> hose, put a quick release fitting at each appliance and on your vehicle
> tank
> and go that route.  You could make a T-fitting with a couple of shorter
> hoses and  snake hoses all over your campsite to various camping gear or
> just use a single hose and run only one thing at a time.  The quick release
> fittings work really well.