We have a Thousand Trails membership with dues at $650/year. There are hundreds of different kinds of memberships and the rules change just about every day. I would want to know exactly what parks are included as there are Thousand Trails, Naco and Leisure Time resorts in the west all owned by ELS. There are also many different reservation rules depending on the membership. There are also restrictions with some memberships for high season use and how many reservations you can have for holidays. Also, in the winter many resorts can be closed. Get it in writing! If sewers are important to you check what parks offer them and how many are in that park. Sites are first come! Low power is an issue in most of the parks, especially when it is cold or hot and the park is busy. For the most part only 30 amp is available - 50 amp is an additional $3/day. Some are very difficult to get a big rig into. They are called "preserves" for a reason. Most are rustic, wooded and gravel/mud or dirt (depending on the weather) roads and sites. It is a good deal if you know what you are getting, can live with it and will use it! We have used our membership alot (full-timers) over 10 years, especially on the west coast and if you have questions on any of the preserves we can probably help you. Feel free to PM us.