Poohper, most comment a year or two or three into their FT travels that they joined too many memberships and never used them, and typically drop more than 50% from their arsenal.
Before you join see how you want to travel and what likely appeals to your mode of travelling. Maybe add 1000 trails after being on the road a bit to see the validity of it being one of the more expensive ones. Also they might not be in the areas you want to travel, and you then start changing your plans to accommodate where those CGs are instead of maybe where you want to really be going. Just saying.
Many can easily be added to your arsenal as you are out and about on the road. We thought we'd like and use several but in reality we've only ended up using Passport America for one year to save us in built up areas when we did California trip in 2018 = San Diego, Santa Barbara, Napa Valley and Oasis Las Vegas (they don't offer it any more!). Any popular parks will start to drop this over time or put too tight restrictions on it being of any benefit.
By all means researching into all available is good, but just a heads up to save some bucks, maybe gingerly join as and when you find you can definitely benefit from them as you go.
Just my 2 cents for which today due to inflation, isn't worth 1 cent LOL.
PS: Also remember that there are more and more RVers on the road today than ever, so maybe even getting into certain places can become a challenge = membership or not!
It Takes No More Effort To Aim High Than To Aim Low - Reach For The Stars