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you do not need a class its not that hard but honestly you need to learn how trailer brakes work and get an understanding of what different kinds of hitches are available as well as the load distributing hitches that you need for longer heavier trailers. on level ground and pulling trailers up hill its a piece of cake keep the speed 55 and you will never have a problem . The one tough part of towing is going down a hill with heavy loads. You get pushed by the dead weight and the faster you get going the more out of control you will be and its really easy to get pushed into a ditch so make sure you have the trailer brakes working a bit ahead of the vehicle doing the towing so you can keep the trailer straight which helps keep the truck straght. Down hill can be the whole ***** of the universe

You need to make sure the suspension of the tow vehicle is up to par and that the towing vehicle is not over loaded for the task at hand. Once past 20 feet the travel trailers get heavy and long they are not all that hard to back up as long as you plan a stop somewhere with lots of room and learn how to back a trailer up until you can do it in your sleep. Its not that hard. The main thing is your speed down a hill you have to keep the truck and trailer under control and under 55 at all times if you get much over rat going down a steep hill and overheat the brakes there is a good chance your going in the ditch. I know one time I had a small trailer on and got the brakes hot coming down a really long steep grade that I did not know was in front of me. About 3/4 of the way down I was out of brakes and I got an interesting lesson in a travel trailer pushing a heavy van down a long curvy hill. I just kept off the brakes at the last bit and while they were cooling at high speed I rocketed around several corners doing my best to keep the van in front of the trailer and going nice and easy when I came around to a long straight away down at the bottom I was one happy guy as the speed bled off and I got slowed down below the speed of sound i was really glad the hill was not a whole lot longer and did not have any more down hill toboggan runs waiting for me. Even with years of experience things can bite you in the butt. better to be prepared and not need something than to need it and not be prepared.