Back to the subject of propane on Sundays, I just remembered another source of propane. Pacific Pride Fuel stops are excellent for RV'ers. Many of their stations are unmanned and you just pull in, use your membership card, and pump your fuel. Most of their stations were designed to handle 18 wheelers, so our RV's will fit in nicely. Plus, they are located close to major highways. You get a monthly invoice and your bank account is drafted. Pacific Pride is related to Pioneer Fuel, and they "share" their web site. Prices are generally $0.01 to $0.05 per gallon lower than other stations in their area.
Now, many service stations have joined Pacific Pride Fuel (Chevron, Shell, etc.). Using Pacific Pride's web site, you can search for stations that have propane! Here is their web site: http://pacificpride.us/
Under their terms of service, I believe that Pacific Pride stations must be open every day, so Sundays should not be a problem.