Couple changes...
BoatUS has eliminated the $350 and $500 cards as they did not sell. The Captains Card went up on the west coast to match the price on the east coast (an $8 increase) but had no change in service area. The Gold went up about the same with no change in area. The Trailer package is now 100 miles vs the $150 (still at $10). That is a big jump.
The hot ticket is the new Freshwater Membership! It is Captains Card service for only $53 ($34 + $19 mem dues). The "freshwater" limit in this area is somewhere between Pittsburg and the Antioch Bridge. Anything east of there is treated like a fully covered tow as before.
Bigwaveohs, The limited dollar cards are NOT worth the money you save in annual fees. Keep in mind that I am billing from the time I leave my dock (Bethel Island, Vallejo, Alameda) until I return to my dock. Our average tow is around 2.5 hours. That makes the unlimited card well worth the money.
Catsmeow, If you are not going west of Pittsburg (New York Point) you will be fine with the Freshwater Card. Anywhere east to Stockton and as far north on the Sac as about Garcia Bend or a mile or two north of Freeport is in the service area that I cover.
As always I am happy to answer additional questions.