I think if you dont ask for a seasonal site, you will have more options. A place I stay at during the summer allows RV,s at any age except for seasonal sites. RVs then have to be 10 years or younger OR have to be inspected by management. I have a seasonal site and mine is older and they said I can stay as long as I like because my rig is well kept. You might want to try and Email some pics of your trailer to where you want to go, they may make an exception.
Personally, I would rather see more older rigs, then newer ones with a bunch of crappy looking fling spread all over the place. Flamingos, palm trees, gawdy awning lamps, tons of yard ornaments, and weeds 8 inches tall growing between most of it.