So got back from work trip, but had a quick turnaround to move across country. Checked all connections and still have not noticed anything unusual, did some rewiring of switches, and added a grounding cable from the body to negative terminal. Have had no further issues starting BUT about 4 days ago started noticing a rotten eggs smell. Smell was coming from house battery and noticed vent was bubbling/hissing. Took both batteries in, house battery was bad, starting battery initially showed good but as they charged it the cca dropped so they replaced both of them.
Good news is 2 new batteries but I am concerned how 2 batteries would go bad in about 2.5 years? Any thoughts or suggestions to make sure it doesn't happen again?