Using rigid bus bars in harsh environments and exposed to the road vibration including high temperatures in the summer if used in vehicle especially in location posted is disaster waiting to happen. You are lucky to have vehicle still in one peace. Building battery pack for harsh conditions or setups that are exposed to road vibration and temperatures that are easily going over cell temperatures require completely different way how they are designed and built. Definitely lesson learned.
My primary charge source for 13 years has been an alternator charging at roughly .4C. The bank has well in excess of 2000 cycles and can still deliver full capacity.Alternators are fine it is how people integrate them with LFP that creates issues..