I made something similar to what you described. I special ordered a T that connects to the tank and continues to pass LP to the trailer regulator with the other side of the T being a quick disconnect. From that quick disconnect I can attach a 50ft. hose. At the other end of the hose I have another quick disconnect that allows me to install another T so I can connect a gas grill and a gas campfire. I don't have a generator yet but the T will also allow me to connect a generator. Unfortunately, I do not have pictures to show you and the unit is 50 miles away in a storage facility.
Everything was ordered from MB Sturgis and they have a good descriptions of all their parts on the web site.
. : M B Sturgis Inc : .Manufacturers of Natural and LP Gas Hose Hoses, Quick Disconnects and Gas Outlets
Lucius