I discovered quite by accident today that our local Home Depot carries a whole line of RV
electrical adaptors
in stock. Might be of interest/use to somebody out on the road needing one. I usually drive by a Home Depot somewhere while on a trip. The adaptors were in the
electrical cord display but on a shelf well above eye level where ordinarily I would not be looking. They had a full range of 15/30, 30/15, 30/50, 50/30, and twist lock to/from as well. The 15/30 and 30/15 were around $9 and the 30/50 and 50/30 $17.