can be purchased from MB Sturgis
. I had Sturgis make up a hose for us that connects to the 40# tank, allows me to connect a propane fire and a grill simultaneously, while still allowing the 40# tank to feed the trailer.
The whole set-up cost me about 1.5X of the PPL parts mentioned in post #2. But I have 50 ft. of hose that I can route just about anywhere. If I can find some pictures I'll post them later.
Sturgis has some off-the-shelf fittings and hoses for RVs but I opted to call them, sent a sketch to them, and they provided exactly what I wanted.