The Nissan Leaf batteries are really not practical for a Scamp
16. They weigh several hundred pounds. Since that article was written, LIFEPO4 cells and LIFEPO4 12 volt drop in batteries have come way down in price.
A 100 amp hour LIFEPO4 12 volt drop in battery which incorporates a BMS (EDIT) weighs 25 lbs. and can be charged with an economical charger. Typical brands are BattleBorn, Renogy and Lion Energy. OR you build your own. One or two of these batteries is more than sufficient for a few days camping, powering LED lights
, a compressor fridge
and a propane furnace
This channel on youtube provides extensive information, bench tests and reviews: