Tractor Supply: Pain in the.... Propane Problems

You will need to find a different supplier. Permanently mounted ones use a different filling method. I am lucky, the one I use has two filling stations (one for removable cylinders and a different pump for permanently mounted ones) at the same location. It is actually a totally different filling nozzle on each.
Our local Costco fills only removable cylinders, can't/won't fill permanently mounted ones.

Ken