I looked into this same type thing in February. I actually stayed in a park model that the park lets you try. Here's what I found. Park models used cost from 25k to 125k depending on amenities. The real kicker is the yearly rent. The site cost is $6400.00 per this does not include water, electric, or garbage and there's a tax for the lot. You don't own the lot but you pay a tax to leave the trailer there. To put a 5er or travel trailer on the lot is 800 per month plus electric which is metered. from the people I talked with you can expect about a 4% increase to the lot rent for the park model every year. The 5er seemed to be a better deal for me since I would only be there 3 months out of the year. If you decide you want to try out a park model they have a program called the fly and buy. it cost nothing if you don't buy and they'll pay for you airline ticket if you do. It was a great way to see if that's what you want.
Good luck
