Defiantly do not use a WFCO. If your lucky they last about a year. The Progressive with the Inteli Wizard is a good system to manage the batteries.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles