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Ben, maybe I'm crazy, but you could probably get an idea of your power consumption by simply timing how long you are out on the road and checking to see how many kWH your killowatt reads. kWH/H = kW. That gives you a running average, which is fine if your generator will actually charge the batteries.
The only issue iwth that is that you'll be using the bike differently when it has a trailer, and drawing more amps from its weight. So take that kW rating and double it to be safe.
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