Brackets to hold the Onan battery tray. I use a full-sized battery to start the Onan, and through the magic of combiners it can serve as a backup house battery. It is charged by both the converter and the alternator (the small Onan battery charger has been removed). The inclined rear floor plate is bolted to the remains of the old one using self-tapping body bolts, plus a generous bead of polyurethane sealant.