External Propane Tank

We used to have a Class A coach and we had the extend-a-stay type adapter to use an external propane tank, so I am well aware of how that works. We have now moved to a Class B and there is an issue with the onboard LP tank not filling. It will take ordering a new tank to fix that problem. In the meantime, we would like to use the van. The onboard tank is well hidden under the van with a remote fill, so not possible/easy to use the extend-a-stay approach. There is an external quick-connect fitting for attaching a grill. So, I am thinking about hauling around a 5 gallon LP tank that I would set out and attach to the van when camping. It seems that I could use a regulator and attach this to the grill quick-connect. However, I do not know if there are any one-way valves that would prevent this and I do not know what it would do when it hit the "wrong side" of the regulator. Any experience or thoughts appreciated.