wiring batteries in parallel question

[Unsullied_Spy]

I'd guess the first number is continuous and the second is a burst, maybe 30 seconds? EC5s are good, they're 5mm bullets with a plastic housing. It isn't uncommon to pull 150-200 amp bursts out of these setups but Deans connectors (roughly 45-60 amp connectors) typically do the job just fine so the bullets will handle it without issue. The MMM doesn't really have a continuous rating because of differences in how manufacturers rate their controllers. 120A continuous is a LOT of amps, but odds are you won't be pulling that kind of continuous amps out of a truck since you'll likely run out of room or hit something before you have a chance to overheat something.