Every park is it's own entity and do things differently. Best bet is to look inside the parks there are usually bulletin boards with cards for sale by owner. Some parks handle all the sales internally, others list with agents and some are mixed. I know down here in SE FL there is a healthy mix of for sale by owner and realtor listings however just last year there were no realtor listings (MLS) but the park had an in house realtor that managed the listings on the associations website. Didn't make sense but that was how it was done for years. Best deals were found on the bulletin boards FSBO.