Has anyone used this site:
Alternative Fuels Data Center: Propane Fueling Station Locations
afdc.energy.gov
I've learned to always call first to ask, Can you fill the onboard propane tank on a motorhome? Some just say no, and one told me that normally yes, but someone had taken off with some special piece of equipment you have to use to fill that type of tank, and they wouldn't be able to do it again until they replace it.Some Tractor Supply managers will not allow the filling of motor home tanks, some do. Virtually all are just inside their side yard gate and readily accessible to a vehicle pulling in.
My go-to place for filling cylinders on the edge of Denver is a garden/landscaping place, which I found only because I noticed a big "PROPANE" sign on the fence. I've never seen it appear it in any online search.One place not mentioned is fireplace/yard stores that sell fireplaces, patio furniture, BBQ grills, pizza ovens, and the like.