We have been members for 36 years I believe. I know you would have problems getting into Pacific City , South Jetty or La Conner and many others WITHOUT res.You can make res on line and no charge to make them. We have the Gold Card Membership which allows us to make res 90 days out go to any TT Parks with no time out between trips. We can go from one Park to another after 14 days. We don't have all the bells and whistles but for $175 a year and no other charges it is hard to beat. We have been to most of TT Parks and we like Calif, Oregon, Wash, Canada best of all of them. At the present time I have South Jetty, Pacific City, Mount Vernon and La Conner reserved.
If I was you I would sign up for the Zone Park plan. You get two zones for the price of one. You could try it out for one year and walk away after the year with no other charges if you did not like it. There are a lot of memberships for sale in all the Parks in AZ {Not TT} I would not buy thru TT as you can get much better deal from private party, sometimes FREE but you have to pay TT the transfer fee of $750 or more