I was able to use regular wiper blades from AutoZone without an adapter. It's kinda hard to explain, but find any brand of wipers where the width of the "slot" in the wiper is the same as the width of the slot in your RV wipers. For my rig, Bosch #40728 wipers had the right slot width. Then one can simply push the wiper arm connector out of the RV wiper and into the the replacement wiper. It takes a bit of hand strength, but the adapter basically just snaps on and off. I never would have guessed that, but the guy behind the desk at AutoZone showed me how, so maybe just ask him.
We hit a doozy of a rainstorm with the new blades and they actually worked way better than the factory version!
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K4EAK
2013 Thor ACE 30.1