I installed our T between the tank and the regulator. So it's on the high pressure side. I use a short flexible hose with a valve and quick-disconnect. This allows me to hook up a 50' hose and route the LP almost anywhere. At the end of the 50' hose I connect the portable fire pit and/or the grill. You could use a variety of fittings to run any number of appliances.
Be sure to LP rated hoses and fittings. Don't do it yourself unless you have experience with high pressure fittings, regulators, etc.
I bought my parts via the web at www.mbsturgis.com
I called them and described what I wanted to do. They sized the hose based on distance and how many BTU's of appliances I would be running at one time.
At the end of the camping trip I turn off the valve shown hanging under the tanks at the front of the trailer and run the appliance until the LP is "drained" from the line. Then it's safe to disconnect all the lines and store the hoses and fittings until the next use.
The valve and quick disconnect shown hanging under the tanks can be coiled and stored inside the tank cover for traveling.