We are total newbies and are considering an Aliner Ranger 12 or Scout for our family. Our tow vehicle is a 2014 2.5i, 4 cylinder with tongue capacity of 200#. We like the Ranger 12 for its amenities(shower, water, dormers, etc), but with dual propane tanks and battery, it would put us at approx 230# tongue weight without any other load. Has anybody switched out steel propane tanks for single fiberglass tank? Say 11lbs? We are only looking to take this on 2-4 night trips and are wondering if that amount would be sufficient. Regarding brake controller and 7-way, would RV or car service department be better suited to take care of that? Thank you all.