Step 1. Add 48 SMD LED lights to every single fixture inure RV.
Step 2. Go to Costco and get a pair of 6 volt golf cart batteries that are about 210 amps hours each and wire them in series for a 12-volt system.
Step 3. Get proper charge controller like a Progressive Dynamics 9245 with a Wizard pendant, or a Power Supply Unit like a Megawatt 40 amp power supply unit from the dealer in Aqua Dulce, CA.
Step 4. get a Honda EU2000i generator to recharge your battery while Off the Grid.
Step 5. Another option is to get about 240 Watts of 12 volt solar panels with about 12 - 14 amps per hour charging capability and make a portable setup out of it, along with an adjustable 30 amp 12 volt solar charge controller to adjust the charging voltage.