Tim check to see what shape yours are in first, Their the grayish hunks of metal that kinda look like lead. If they have a good solid look to them they're fine if there all corroded and crusty looking replace em, you usually wont have to do all of them. If you keep it on a trailer the wear usually isnt too bad. It depends on much electrical "leak" you have on the boat. You may not need to replace yours for quite some time. My old Scarab went 7 years it was used mostly in fresh water with a half dozen salt trips a year and it was stored in the fresh most of the summer and trailer in winter.
I'll definitely be checking it out when I get back. I may pull them off regardless while i'm working on the rest of the boat just to get the experience.
Thanks again guys!