I’ve begun outfitting my new (to me) Metris Cargo, and ready to fit a inverter in it. I have a Dimensions 12/1200 Pure Sine inverter. And a large Marine deep cell battery. On my last van, I ran the main battery cables from the inverter to the marine battery - then jumped off the marine battery to the car starting battery in parallel. Would there be any issues doing this on a Metris?