John -
I've forgotten if we've touched on this, so forgive me if I repeat. At the time when you can see the gap, are the corner latches latched on the front corners? I suppose it is possible to crank down so hard on those latches that it levers the front of the front shell down and the rear of the front shell up. If the latches are latched, unlatch them and see if the gap closes.
Also, are you convinced that there is nothing inside the trailer that is too tall, keeping the front shell from descending all the way?
Finally, if you stand at the rear edge of the front shell and hang your weight on it, does it move down appreciably, closing the gap?
Bill
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