I picked up one of the Marshall Extend-A-Stay kits for a previous RV and then we got a different one before I installed the kit. Next RV had an outside tap and it spoiled us. Current RV didn't have an external propane connection so I installed the T adaptor that that I still happened to have after many years and it works great!
Link to kit:
https://www.rvsupplyparts.com/catalo...r470-7072.html