I personally would do it and not think twice about it. I made it from Ft Wilderness @ Disney to my home 600 miles well before dark in early July a few years ago. We left about 5 am and made it back home about 5 in the evening. Averaged about 50 mph just take it easy, watch your tires, and you can do it.
Me personally, I love to drive and I make several trips from my home to Florida "straight through" every year.
Pulling with my Dually really made towing a pleasure. But alas, that's a different subject.
The only real problem with pulling that far is all the bugs that accumulate (rapidly btw) on the front of the camper and on the leading edge of the golf carts roof. :)
Here is a pic of the rig that I did that trip in.
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Thanks!
Jeremiah