It just goes to show people can do unknown harm to their expensive rigs just doing what they think is "OK" like battery equalization of the house batteries. I have not read in any of the manuals including the inverter/converter that equalizing the starter batteries is not recommended. Or anything about removing battery caps to stop your batteries from exploding during this process.
It's obvious you can't take the caps of the starter batteries as there aren't any. And most people won't disconnect them because they're a pain in the rear to get to.
Would it be so hard for manufactures to put a charger cutoff switch so only the the chassis batteries get charged when equalizing?