Battery water systems are excellent as long as they are working. If one hole goes dry......the chain is only as strong as the weakest link. Pull all the valves and use a hydrometer. Seen plenty of industrial crown batteries toasted by bad water valves. But it is a trade off industry makes for reduced manpower to pull all those valves. In their case they are running 300 plus 4800 pound batteries vs you or I running one.
Dont those interstates also want a pretty high charge rate like 15.xx?
Trojans are 14.8