Towing Problem or Normal Towing???

[TheJeep]

I have two questions when it comes to towing my Montana. I am new to towing, we had a Motorhome and towed a Jeep before upgrading to the Montana. Our TV is a Dodge 3500 Dully with 410s. The Montana is a 3455SA. So 2 things that I have noticed is that sometimes at highway speeds (55-60) I have noticed that the truck feels like it is bucking. Maybe better described as chugging. Is this normal? I thought it could be the wind hitting the front of the Montana. Second problem is when I am stopped the trailer brakes take about ½ a second to a second longer to release than the truck brakes. I thought they should release at the same time. Is that a problem with the truck or the trailer?
We had our first trip with it last weekend and had a great time. Any guidance on the problems that I have notice would be very helpful.

Thanks