I've seen RV's pulling sub-compact cars. RV's pulling compacts, not-so-compacts, trailers with the motorcycles or lawn furniture and the grill. I've even seen RV's towing pick-ups and SUV's. I clearly remember the day one of those RV's built on a tour-bus chassis passed by. (Eep.)
But an RV towing… an RV?
And note that it wasn't a little RV. Either of them.