Hi,
I would be more concerned about the 200 pounds of overload on the rear axle than the front axle being 500 - 800 pounds to light. Yes both are concerns.
Look at what is in the storage bays. Move the heavy stuff forward. Same thing inside.
Where is your fresh water tank? Was it 1/2 full or empty when you did the weight check? That can change things quite a bit - normally about 100 gallons or upwards of 800 pounds of water in them. You really can't do much about the black and grey tanks, other than realize that when you do fill them, you will be overloading the rear axle even more. So best to find a place to dump before heading out on a 800 mile drive on the interstates. And do not travel with a full tank of fresh water when the motorcycle is also on board. 1/4 tank is more than enough for washing hands and flushing. You can keep a couple of 1 gallon drinking water containers in the sink or refrigerator for drinking.
Have fun on your travels!
Fred.
