Personally I think the Liberty's wheel base is too short to tow much of anything other than a boat, not to mention it has a high center of gravity. I'm one to talk though, my X20E brings me close to the rated capacity of my Trailblazer and its a surprisingly good towing experience.
Your x17z is well within what the Liberty is rated for. Without know the specs on your engine, I suspect you'll be just fine. Especially if you aren't towing up 6% grades on a regular basis.
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Chuck
2013 Jayco Jayfeather X20 E (sold)
2016 Chevy Silverado LTZ 2 Z71 Crew Cab (sold, and dearly missed)
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