Don't worry, many private parks post coach age restrictions with the caveat that units over 10 years old require inspection prior to registration. What they are usually saying in print is that they would prefer not to have yellow school buses, down and out rigs, and converted milk delivery trucks (I've seen them out there). Without a posted restriction the parks action could be viewed as discriminatory against the individual requesting privileges. Camping at a few parks with this restriction I have viewed some lovely classic motorhomes and trailers in excellent condition. Two weeks ago I was at a resort and saw a club with coaches I remember from the 60's. Happy Trails.