We also are worried and carry 5 gallons of ballast water under the front dinette to counteract the 2 bikes and rack. In Osoyoos we were weighed and had right at 400# tongue weight, the bikes, rack and bike cover were on the back at the time, the water tank was full. We have been loading up the front storage container: electric torque wrench and sockets, a gallon of distilled water, a gallon of antifreeze, X braces, anything that I can think of to increase weight in front. Under the front dinette we also carry boxes of wine, a case of cat food, bottled spaghetti sauce, etc.
The 100# limit in the front storage box seems unreasonable. The 2-6V batteries alone weigh more than 100#. Since the box is reinforced under the batteries, we take that 100# of advice as only an additional 100#.
Myrl and Gary