If after a spin test, checking for out of balance condition, and replacement - if it happens again, check if your rig is out of alignment. We had that condition for two years in a row. Our RV tech recommended a local shop to check alignment after replacing the hangars, U bolts, and replacing the Equa Flex suspension parts; he was right. We were out by 1/4" and that's a lot. The alignment check was about $250 but well worth it.
Every year we take our FW to the tire shop and have them to a spin test and inspect all the tires. So far so good after new tires in 2014 and fixing the above issues.
2011 Bighorn 3055RL, 2011 F350 DRW 6.7L 4x4 Diesel Lariat and Hensley TrailerSaver BD3, 1992 Jeep ZJ and 1978 Coleman Concord Pop-Up for remote camping
Dave & Renee plus (Champ, Molly, Paris, Missy, and Maggie in spirit), Mica, Mabel, and Melton