I first encountered this when My rig was about 10 MONTHS old.
And I made a decision I still practice today
"If they are so busy that they have to turn an RVer away simply because of the age of his RV.. Then they do not need MY business"
And I parked elsewhere.
And I ask all who encounter this king of park policy to do likewise.
I might add.. 3 miles from where Im parked (Give or take a few hundred yards) is such a park.. I've visited that park (for like an hour) my first trip here (Dumped tanks, showered and left, gave 'em a few dollars, did not hook up save for water and sewer)
Park where I am at, no such policy.. WAY MORE FUN.