[O'silent1]

I tow a 2004 R-vision lightweight expandable travel trailer. It is 3750 dry and 5400 wet. I don't know how tall it is but guaranteed, it is taller than 6 foot. My Titan has the tow package and is 4wheel drive. I have taken two long distance trips with it and the Titan has performed exceptionally well for a V8 half ton truck. I definitely know that weight is back there as it demands my respect but at the same time, it tows it with ease. The only time I can not out accelerate the grade is when it is approaching 6-7% and even then, I can maintain at least 55 (granted no one pulls out in front of me and kills my speed). Most of the time, I am passing other rigs up grades (including the smog bombs) and I'm not having to flog the Titan to accomplish this either. You should have no problem with the kind of load you are talking about - but then again, it is all a matter of personal opinion!
Also, EDIT AFTERTHOUGHT - the only time my Titan has worked really hard was into a pretty stiff headwind between St. Johns, AZ and Flagstaff. I had to lock it into 3rd otherwise it kept shifting a lot and I averaged 7mpg. Usually, I can average 11-12mpg towing.
*Sorry, I never resized the pictures to a smaller format.