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Yes ljensen. Like firetrucker mentions the trailer never carries ALL its weight on both axles. The remaining weight from 15 to 25% of the total RV weight will be carried "over the pin" which rides on your tow vehicle, or when not towing is carried by the landing gear at the front of the rig. Just make sure to weigh your rig (TV, RV, each axle each side) to confirm the weights are properly distributed.
Regarding the higher number on the brake control, you might need to adjust the RV brake shoes manually. This is assuming you have drum brakes on your RV. As shoes wear the distance to travel to make contact with the drum can increase unless you have automatic adjusting. Adjusting the brake shoes so the gap is lessened should help.
You should check your RV wheels to ensure they can take the increase in pressure. Before you do this, what size and load rating are your tires? 80# should be enough pressure with your 3400 but we'd need to know the tire specs to be sure. The 3400 is a very popular rig amongst MOCers so hopefully they can comment.
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