I just received the following reply from Good Sam Customer Service:
"Thank you for contacting Good Sam. I haven’t heard of any policies like this. It might be referring to a dealership warranty (if the RV was bought at Camping World) that says that free repairs would have to be taken care of at Camping World. There are no limitations on where you can take your vehicle for repairs through ESP, and ERS doesn’t cover repairs.
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[email protected] or call our Member Services at 1-800-234-3450 Monday through Friday 6 AM to 7 PM and Saturdays 8 AM to 4:30 PM Mountain Time."
My guess, at this time would be that your dealer doesn't want to accept Good Sam Extended Service Warranty work and the note on the desk is his way of saying "NO" to your ESP from GS.
Suggestion: Ask him specifically what it means and if he tells you that GS won't pay him, call his "bluff" (nice way to say lie) and show him the response from GS, or ask to use his phone and call GS and ask them to explain it to him, OR: you could just simply walk away and not return, EVER !!!