Rich, we have encountered this "flattening" of the carpet nap in our 3280. We have been fulltiming for one year, and have decided that when the 3400 gets here we will put a runner up the steps into the bedroom/bath area and also a 4X6 or better carpet at the entry along the kitchen island, as this will be a high traffic area also.
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The carpet nap is a cut pile as you are aware. If they had left it as a loop style instead of shearing it the wear pattern would have been much better and it would have forced them to put a slightly heavier pad underneath in my opinion.
Hope you are both having a ball on the road!!!