I have it as well in the same year same model same speed. It's very slight and is non-existent at any other speed. So, I've just let it go.
By the way, on my last trip I was entering a town dropping from 63 mph I was traveling to 55 for a reduced speed limit and instead of checking my speed the vibration notified me before I could glance at the speedo.
If it was more significant or any any speed I usually travel I'd see what could be done. But since it's not been a bother and it is very slight I let it go.
I remember hearing some reports of driveline imbalance delaying some 2016 chassis when they first switched to the 6-speed transmission. I never put the two things together. My 37F was built in Sept 2016 and is listed as a 2017 on all the documentation. But the VIN says the chassis was built in July 2016.
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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