Found them! Best Converters. Moved to Alabama 2 years ago. Seemed like a lot of TC'ers like PJ9 liked them. PJ9 isn't right. He is a boat Captain. Anyway, mystery solved. Thanks.
'17 Class C 22' Conquest on Ford E 450 with V 10. 4000 Onan, Quad 6 volt AGMs, 515 watts solar.
'12 Northstar Liberty on a '16 Super Duty 6.2. Twin 6 volt AGMs with 300 watts solar.