Tried it with about a 40# igloo cooler on the luggage rack one day and it didn't even require 2/3 throttle - pretty exciting the first couple of times it happened and not good when it's unexpected...
That reminds me, I was in San Francisco on a Sunday afternoon cruising up the Embarcadero. Came to a traffic light and stopped behind the cars several back from the front. But up at the front I noticed a beautiful blue FJR, two up. Then the light turns green and I hear that FJR gun it, and I'll be damned if that front wheel didn't come flying up off the ground! I thought, "Damn! I'll be that girl on the back, AND the guy, were shocked as hell."
JB