My 6v "golf cart" battery from Costco in Tucson had a reference to Johnson Controls on a label. The plastic case looks like it came out of the same mold as the old Trojans I replaced except for the color. I did not get good performance or life out of the Trojans probably because they had been neglected and were almost dry when I bought my used motor home. Trojan and other top line brands may have better or more refined plates or paste on the plates to justify higher cost--I don't know. With any battery, maintenance is the key.
'09 Pleasure Way Lexor, Chevrolet Express 3500 chassis, 6.0L V8
Last RV, 2005 NRV Dolphin 5342 (2007-2014)