Tire pressure. Tire Pressure, TIRE PRESSURE! Keep 'em hard!
The "Lowest hanging fruit" for you is going to be in the belly pan, rear wheel skirts, and hanging a short frame off the back to make a half-assed kammback type extension. You could call it an "awning", basically.
You could try a partial grille block, but I don't know how your truck would react to that, being a motor-home... all that extra weight to pull around means more load, so you might overheat... couldn't hurt to try, though.
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