Hi, do you have any other experience towing anything else? If so, that will help.
These big beasts feel totally different than anything you may have towed, even enclosed trailers are typically lower and more aerodynamic.
Basically, the trailer is going to get some push by passing vehicles and the wind.
Make sure your WD hitch is dialed in, same for your brake controller, same for your sway control (if using sway bars (if so, you should really be using TWO bars))
Also, my speed limit is 58 MPH while towing. Life is so much happier at 58 MPH for me. That was that way with my previous rig and with a Dually and my current rig with my Tahoe. 58 MPH and I happily let people pass me as I am in the slow lane.
Thanks!
And all is JMHO based on experience..
Jeremiah