Amazon.com: RV Battery Lock - Bracket for 6 Volt Battery Box or Double Box for Travel Trailers and popup Campers *** 1 Bracket only, You Need to Purchase 2 if You Have 2 Batteries**** : Automotive
Amazon.com: Camco Double Battery Box | Safely Stores RV, Automotive, and Marine Batteries | Features a Heavy-Duty Corrosion-Resilient Polymer Construction and Measures Inside 21-1/2" x 7-3/8" x 11-3/16" (55375) : Automotive
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How Does TorkLift PowerArmor Solar Battery Box Mount and Can Two 6 Volt Batteries Make 12 Volts | etrailer.com