What year was it?I pulled a 4000 traveler through the east coast and the PF just died going up the hills and in no way could it maintain 60mph. I tried as I was trying to catch a ferry, and it put the transmission into high temp mode and forced you drive under 50mph by cutting the throttle. My travel was based on maintaining 55mph. I was late and gas MPG went through the roof.
On the flat absolutely, no issue and it was a joy to pull and handled very well at highway speeds with plenty of pull power. Going down steep hills with turns at the bottom became a white knuckler a few times as you could feel the trailer push and lift the rear end. I had a WDH installed and I think that made the world of difference and also helped level the vehicle out. Gas MPG was very acceptable on the flats at HWY speeds. On relativley flat HWYs I got very close to my actual city MPG while pulling the trailer on the HWY.
So, it depends on where and at what time of year you plan on traveling as these things can negatively affect your results..
Pulling a travel trailer much heavier than 4000lbs in hot temps where hills are concerned definitely is going to cost you and IMO would be a very costly dissatisfying option.