Bellows seem to last forever on trailered boats that sit in the shade. I replaced mine after 7 years and they still looked fine (I was doing other work that required bellows removal). I know people that have more than a dozen years on them. I suspect constant immersion in dirty marina water and or sun exposure kills them fastest.
Bellows are easy enough to inspect when the drives are off for alignment check (something you should do every year), that's what I do. You should do the same when you are looking at the boat. If you think bellows changes are expensive, you will be shocked by the cost of a coupler replacement.
My batteries are both more than 5 years old. I figure with two, I can gamble that they won't both fail at the same time.
If costs are a big concern, you may want to consider learning how to maintain it yourself. It's enjoyable work and not at all difficult with the right tools and manuals (which would cost less than two bellows replacements).
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