Your truck should have no problem pulling 17k even over 20k lbs, provided the hitch is up to the task and the trailer is properly loaded and strapped. I have towed 14k with a half ton, braking is the only limiting factor worth noting. That half ton was grossly overloaded for its braking ability. Otherwise, numbers mean little, If you don't feel comfortable towing it, you probably shouldn't attempt it. The route you will be taking is also a factor in how fast and how heavy you can tow.
Many people are under the impression that if it will pull it it can tow it, and that is far from true.
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