Sounds like your on the right track...
I personally just installed a better headunit and speakers. I think the Amp and sub are kind of a waste in a trailer and will do more harm then good in the battery department.
My 05 weekend warrior dosen't have outside speakers so I was gonna put another HU in my front storage cubby(the remote would work from the fire) and wire it seperatley to one battery. I then was just gonna throw some 6x9's 9in boxes and un wind some wire when we are camping.(seemed easier than trying to get wire to the outside of the rig

)
I ended up turning my Rhino into a rolling stereo instead...lol
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