I am finding the mini max battery is limited in capacity, especially for heating at night. An acquaintance, suggested two 6 volt golf cart batteries wired in series. These are quite heavy at 60lbs each, so leery about adding120lbs to the mini's front tongue. So, tentatively, planning on mounting them on a cargo carrier on the rear trailer hitch (placarded @ 175lbs max). I searched the forum and could not find any info on mounting locations or the electrical tie-in used for the mini (assuming front tongue additions tie-in to the original battery). IF you added batteries on the mini, please share where you mounted them and where you tied them in to the electrical system. Thanks folks.