:) Hi, I towed my 6,300 lb. GVWR travel trailer for over ten years with my 2000 Lincoln Navigator with no problems. In 2015 we towed this same trailer in our cross country trip of over 13,000 miles. This was done with our new at the time, 2014 F-150 Ecoboost crew cab short bed truck. I have Max Tow, 3:73 gears, and 4X4. I drive with the flow of traffic and above the speed limit by about five MPH. I get right at 10.8 MPG when towing. I get about 16 MPG in local driving and can get as high as 20 on the road, but I don't go on long trips without my trailer so I don't have a real highway mileage. My trailer's tongue weight is about 900 lbs. and my payload is 1745 lbs. This leaves me plenty for my wife and I and whatever I put in the bed.