I think the Motorcoach notification is meant for buses coming filled with people.
I've stayed at many Flying J's and get my dumping done, fill my lp if needed - and the one time I pulled in LATE at night - I just pulled in the truck lot and found a place along the side.
It's probably too late for you to apply for a Flying J rv discount card before you pick up - but grab an application at one of them and make sure you do it when you get home. Every little discount helps! Bethers

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--------------------------- Once your reputation is ruined, you can live life quite freely :) (old German saying) Bethers