I just got back from a 1,654 mi trip to WV, Pigeon Forge TN, and East Asheville/Sugar Pine NC. Lowest mileage I saw when towing my 5,700 lb 24ft travel trailer was 13.5. While on the Camp Creek WV to Pigeon Forge leg, I had the check engine light come on. I took it to a RAM dealer (Rocky Top)...