"Sorry, we do not take those any longer..."

During our travels across the USA we encountered several CGs with 'RV Type' Restrictions IE: No TC, MH only, 10 yr rule
East Coast, West Coast and places in between

Just as with any business the Owner decides type of clientele they are wanting and the risk/benefit of their choice.
It is after all their investment in time, monies and effort so they should get to decide.
Good for them.

I personally do not support establishments that require neck ties.

Have they been full? Do you keep your TC clean?
Not only such attitude never happen to me with TC, but in the past I was driving 25 yo Prevost conversion and camp several times in "10 years or younger only" RV parks. Never had an issue.

Which campground was this? There's a very small number of them in that area and they can probably be counted on one hand.

Another reason we select State Parks. They can't discriminate. Private Campgrounds can do whatever they want.

Yes, I have heard of this happening before. It's been brought up a few times on these forums in the past.

So, you are now officially a "Trailer/Motor Home Challenged" RV impaired owner! ;)

Could you give the name of the CG so anyone with a TC knows they are not welcome?