Towing across country or 1-2 hours away?
It's all in what you are comfortable with, within reason of course. I tow and have towed 28 ft campers weighing in, fully loaded, around 7,500 - 8,000 lbs. I'm comfortable towing that without a problem. The brakes on the camper basically stop my truck. You cannot go without good brakes on the larger loads.