Yes you can!
Yes ...or singles
On a Class A or other permanently attached propane tank - Yes.
Yes.
The propane tank needs to be out of the rv. I filled my 4 20 pounders for my rv. 7 bucks. Each. Not bad..
If the feed tube is outside then no problem..
They fill tanks very reasonably, I might add, but not sure about inside the RV. I would call ahead.
Not sure, regular propane I Know. I would recommend calling them
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