So about 105AH to charge one battery. Don't even try to use a 12V "charger/cig lighter". They usually are fused at 5A, or 60W output. Compared to the 200W or so the AC charger requires, your charge time will be even longer ... like 2-3x longer, and you still have to use 105AH. If that's coming from your truck battery, you will need the bike to ride home.