I am looking for suggestions on battery placement. I have a 2016 LTV 24MB. I have the standard two 6-volt batteries behind the entrance step. I would like to add two additional batteries. I would prefer to NOT place the additional batteries in a outside basement storage compartment. Has anyone found an inside location for additional batteries in the murphy bed model? I hope to switch to lithium batteries so a concealed location would be fine. I have tried to research this question on the forum with no results. Thanks.