You'll want it level or down in the nose, a negative angle of attack. If you lower the back and not the front it will wander all over, and topping a rise into a headwind may offer a big surprise. Leave it up and add spats to the wheels.
As for the aerocap, I don't have one, but I recall others saying better directional stability and more resistance to buffeting from oncoming trucks. Read what you can find on aerohead's T-100. Even if the crosswind's speed equals your forward progress, that's an apparent angle of 45° and the aerocap's taper will be 22 1/2°. 30mph crosswind at 60mph would be 30°. etc.
Maybe a tail fin?
