Ray, get someone to put in a dual battery controller, suggest http://www.traxide.com.au/trax1sc40_2.html (AULRO Member discount https://www.aulro.com/afvb/) and then run a cable from the controller to a anderson plug and connect the deep cycle battery up to that, easy.
then later on you can put in the solar panels etc https://www.aulro.com/afvb/ more $$$$$
what do u plan on running off the battery and how long for without recharge ??
Matt.
