Gramps, sorry to hear about your battery issues. I can say without a doubt that the Workhorse chassis does some really wierd things on low voltage. My dash display said things like ABS system fail, the front step would extend / retract by itself, etc... The bus doesn't like low volts.
My chassis battery died a quick death as well. Have since put on a Trik L Start and all is well.
30K miles on the machine so far and after my next hydraulic pump replacement, she should be 100% again.
2012 Entegra Aspire
2012 Nissan Xterra Pro4x Tow
Ready Brute Elite