They weigh in your baggage at the flyaway.. If it's above 50lbs they'll ask you to either consolidate your bags.. But you check in at LAX with the airline you actually fly with..
I've been to to Van Nuys Flyaway many times and I don't recall them ever weighing my baggage there, unless that is something very new. I do fly International and do take a lot of luggage. Anyway, either way, you will have to have your baggage weighed at LAX.
At lax..
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