Did you get it yet?
I was in your shoes Friday. We fell in love with the Open Range LT272RLS back in March and ordered one. Came in Friday and it was my fist time towing anything with my truck (nothing like diving in). It's the same length as yours - 35' bumper to hitch (31' box).
Followed the advice of the dealer and everyone else - take it slow, take turns wide and watch the wheels. I was pooping bricks. Especially when they made me pull it out of the service bay!
Towed the 60 miles home just fine. First turn out of the dealer's was a right. 2nd turn to the highway was a right turn. Same deal. Then 55 miles of highway driving. Passed by cars, trucks, etc and no sway at all.
Much easier than I ever imagined. We have a Max Tow F150 Ecoboost and it handled the trailer excellently. A little porpoising but I think that was made worse by my P tires not aired up all the way and a full tank of water the dealer put in the trailer. You could tell it was back there but to was not unwieldy, even in a somewhat panic stop.
Took some getting used to but after a few miles I was good enough and it will only get better with time.
Backing was tough but I slowly got the hang of it. It was pretty easy once you learn which way to turn the wheel and realize little wheel corrections mean big turns at the rear end.
You can do it!