I do this and still have my tank. With the Landmark I find that I really don't need it with 2 40 lb tanks on the trailer. However, if you want to use one I would suggest you go to a local propane dealer and look for a hose. I took my OEM hose off the regulator with me to match up the male ends and then bought a 20 ft. hose (why 20' I don't know). Check your 100 lb valve to confirm what kind of fitting it has. Mine had internal threads so you want to make sure both ends of your hose match up and away you go. By the way taking the OEM hose off requires a little patience as in my case there was little room to work and the hose is stiff.