Here in my neck of the woods, I asked this same question a few months ago:
Because of all the people coming in for oil stuff, some CGs actually are picky about the 10 year rule, unless you have an Airstream or high-end class DP (such as the one above). I've yet to have the VIN of my rig run, but usually if one reserves online, one sees, "Any rig older than 10 years must be approved by management", and oftentimes on busy weekends, they can turn away rigs at will.
For me, because of how busy central TX is, one of the primary factors in my next rig is buying it either new, or within the past five years. This area is turning into the next LA/NYC, so I wouldn't be surprised to see more CGs enforce stuff. Already, one RV park south of Austin on a private golf course has started to only allow type A rigs, 40 feet or longer, and 10 years or newer. I won't be surprised to see a lot more places trying to "zoot it up" by going the exclusive route soon.
