Summarize this article in one sentence.
National clubs have chapters all over the country and are generally the largest clubs, meaning that they can provide the most number of services.  Good Sam Club - This club gives you discounts at roughly 1600 different RV campsites in the US, as well as discounts at Camping World and a subscriptions to Highways Magazine. It is one of the largest RV clubs. Escapees RV Club - This club has excellent mail forwarding services for those who just want to get away, permanently. They have local chapters and a discount pharmacy drug program, as well as classes that teach you have to RV with the utmost efficiency. Passport America - This camping and RVing club offers 50% discounts on over 1800 campgrounds. It is one of the largest clubs and offers many convenient services. Boondockers Welcome - This club for RVers facilitates invitations between members to camp for free on each other's private property. National Parks Conservation Association – Member donations help to preserve our national parks for future generations. Members receive National Parks magazine, the Park Pak information kit, invitations to NPCA tours, discounts, and more. The National African-American RVers Association – The NAARVA is a a nationwide camping club dedicated to providing family support for RVers. TrekAmerica – Adventure travel programs for all ages, including camping tours, walking tours, and lodging tours. Each state has one, if not many, regional RV clubs. You can go online to do an internet search to find RV clubs listed in your area or the area that you are planning on traveling to. An example of a regional RV club is Mavericks RV club that is dedicated to serving RVers in the Central and Northern California regions (generally from Bakersfield to Sacramento.) The Mavericks generally hold three to four events per year. Specialty RV clubs are clubs that were created to gather like-minded people and RV around the country. These specialty clubs range from clubs based on favorite hobbies to sexual orientation. You can perform an internet search to see if your specific interest is represented by an RV club. Here are a few highlighted specialty RV clubs.  American Camping Association – Accrediting over 2,200 kids camps for health, safety, and program quality, this not-for-profit organization helps you find the right camp for your kids (and adults), even if they have special needs or disabilities. Dedicated to serving the community of single campers and RVers, with gatherings, activities, and rallies for those enjoying the single lifestyle. Rainbow RV - This RV club was created to gather the RVing LGBTQ community. This club puts on many events each year and offers many discounts to its members. RV Consumer Group – The Consumer Reports of RVs, this non-profit organization provides members the resources to make knowledgeable RV purchases. RVing Women –  This organization, addressing issues specific to independent women RVers, provides members with relevant information, RVing Woman magazine, rallies, caravans, and seminars.

Summary:
Learn about national clubs. Learn about regional RV clubs. Learn about specialty clubs.