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Okay. I am about to take a trip with my 05 Road King Classic. I weigh about 200lbs, my wife about 118lbs and I will have two full saddle bags and a touring bag on the back rack.
My wife and I have the same weights as yours and I ran 20 lbs. on a 1650 mile trip. What the other guys say about tires is correct as well because the back tire will get hot if it's underinflated.