So far my first thought is move the 50 pound battery to under the bench seat in the camper, behind the axle. Or, under the trailer somehow (Red Chili style!). As I add bikes, the tongue starts to look pretty heavy and I'm guessing that 100 pounds is still enough weight to safely pull it empty?
99 uzj100, gx470
05 525EXC, 01 XT225, 07 TTR90, 07 CRF50