This is not true, at least at Disneyland. Both load areas in the right hall have the vehicles facing the ride door and load from their left hand vehicle doors. Could your information be outdated? I wonder if this has anything to do with the accessibility revisions. I had no idea the RVs even had functioning right hand doors.I could have been clearer. The second /end load hall of the two to the right drives out forwards. The other / first one on this side, and both on the left side, reverse out.
IIRC the first load area to the right has guests load via right hand vehicle doors. The other three load areas all load via left hand doors.