I have only about 4K on mine if you include transport to the original dealer and do not have wear issues yet. I would agree with all the scenarios above and get to the dealer for the paper trail. The fact that it is one isolated spot makes me lean more toward a bad tire belt than alignment. Sometimes hitting a pothole or road obstruction can break a belt and lead to the bulge effect where you get uneven wear. Being under the trailer you may not fully feel it like on your TV. I had it happen on a GY Wrangler once and it felt like I was driving on cobblestones.
Either way running a tire like that could lead to a blowout and more damage to your trailer so you should replace it. I would be curiuos to hear how Goodyear works with you if it's a bad tire. I haven't fully read the Jayco warranty, but one would think tires are not covered by them, but the manufacturers. The dealer should be able to elimnate most mechanical issues and pinpoint the problem.
Make sure you save the tire until it's settled just in case you need it for further examination.
2014 375 BHFS Eagle Premier
2014 Ram 3500 Longhorn DRW CC
6.7 CTD, Aisin, 4.10's