Other tips before buying into a deeded park..
Rent a site if possible in the park and spend some time in it.
Read the newsletters, financial reports, and board meeting minutes.
Research state laws for probate or transfer on death applicable to the lot if you die before you sell it.
With housing prices going through the roof in most areas, the same is happening with the prices for deeded RV lots. Tred slowly and carefully...you don't want to get stuck owning something you can't later resell if the market turns down.