As you might have seen from my pics, i just did a 7000 miles round trip across the USA. What is the reason for a trailer? What do you plan on putting inside of it? I had more than enough room with my drawer setup and bed build, and the roof rack to store more crap.
Anyways, my weight for the trip was around 7500lbs or so once i'm loaded with food, water, extra fuel, going up mountain passes were awful. Maybe my oversized tires or just the overall weight of the vehicle, it constantly downshifts when i'm on cruise control, and when i'm taking full control it gets tiring as i have to really mash the pedal to keep it from rolling backwards. You'll be near redline most of the way when climbing. I though the truck was going to sh!t itself but it pulled through.
That's my 2cents, unless you HAVE to, i wouldn't tow a trailer, that hinders your offroading capabilities as well. pack light, pack tight, enjoy the ride.