I had a WD hitch for years. Towed a 7000 pound Traveleze with a diesel surburban. The hitch came with the trailer so I didn't have to set it up. Don't think it's hard though-may just take some time. Idea is to get the whole rig level when the spring bars are parallel with the tongue of the trailer. It depends on the height of the ball. Anyway, once it's set up, it's easy to put on and take off. I've had the trunnion style
Weight Distribution Trunnion Style and the style where the spring bar bends up and fit's into a tube on the ball mount. Don't like that type so well since it's hard to see up inside the tube and I didn't like the idea of dirt and rocks sticking to the end of the spring bar and ending up inside there. The trunnion style is way easier to clean since everything's out in the open. The WD fits into the 2" receiver just like any other ball mount. Lift brackets are attached to the frame of the trailer, if there are any boxes attached to the tongue, it could be a problem. Hitching up is pretty easy. Hitch goes onto ball and locked on. Trunnion bar goes into ball mount, and chain on other end of bar hooks onto the lift bracket which is in a down position. A short steel pipe that comes with the hitch is used to pry the bracket up into running position. You can jack the tongue up after it's attached to the ball to make this part easier. After you repeat on the other side of the tongue, you raise the tongue jack and away you go. (well, you hook up the electrical, breakaway switch and safety chains too, of course) I found towing much less tiring when using the WD hitch. Trailer was less likely to start fishtailing too.