Dan,
Best advice I can give is *slow down* and relax. Make sure you have sufficient TV for the trailer (including wheel base to trailer length), if a TT have Equilizer or similar sway control (if 5er you're already golden here), and don't be afraid to go slower than traffic in the right lane or to take up extra space on a turn if needed.
Once I realized it wasn't a rush and the world wouldn't end if I had to hold up traffic for a moment negotiating into a tight gas station turn or something life became MUCH more enjoyable. I actually PREFER pulling the 5er now to driving without it. I just lock in cruise control at 63mph and sit in the right lane enjoying the ride. Watch the road as far ahead as you can to anticipate, keep a large buffer in front of you, pay attention to road curve speed signs and *bump* signs, and signal your intentions far in advance.
The more you drive, the more comfortable you'll be. Safe travels.
Ron
