We have a wonderful 35i and love it. Looking for information from folks who are using their X5, either gas or diesel,for towing a trailer that weighs around 6000 lbs loaded. Interested in fuel consumption if you have a gasser. Have you found a suitable weight transfer hitch? How does the X5 climb hills? How does it handle going down steep grades? Have you added any tow specific reliability modifications? Really appreciate your experience.