Trojans are considered a good brand, and probably have a large dealer network for warranty work.
If they're not charging
, I wouldn't expect the batteries to be bubbling, unless the charging
just stopped and the bubbles haven't all gotten to the top yet.
If you have a good 6V golf-cart style battery
, they can survive some deep cycling and may still be OK, if not 100% like new. If they take and hold a charge, you might get another season out of them. That said, batteries don't get any better over time. If there's any doubt, new batteries are the way to go.