I'm on my second travel trailer with my 2007 F150 w/ 5.4L and 3.53 gearing. Last trailer was 6,800 empty - 33' long and the new one is 7,600 empty - 37' long. Your always gonna have people insisting you need a 3/4 or 1-ton truck . My "experience" has been, invest in a good weight distribution and sway control system. I have the Equalizer and it is very good. 18 wheelers I barely notice even going in oposite directions on 2-lane roads at 60 mph. I have no desire to take this rig out west into the mountains, but have towed to the OBX and to Boston/Cape Cod last year w/o any problem maintaining 60-65 mph while getting 9-10 mpg . Even while passing larger rigs while climbing grades. Yes, the truck will run to 3,500 rpm while climbing some grades in 3rd gear but that's what it's supposed to do. For the 5% of the miles I tow total for a year, I can't see spending the extra $ in payments and gas the other 95% of the time. Plus the 1/2 tons ride better (IMO). Good rule of thumbs, take your towing capacity and buy a trailer the is 80% of that weight empty. You should also deduct for your toys since you are buying a Toy Hauler. If you buy new, expect to get 30% off of MSRP. That's a good buy. If you can get more then that's a really good deal. Now who is this "Dyno Brian" others have referenced:confused:?