1 tire points out

[Jpdavi1]

What could be bent? All other tires are straight but front passenger side tandem axle.
2012 Z1 with Boatmate , 18in rims.

[Bakes5]

Trailing arm spindle and/or axle. Impossible to tell which one. I ended up replacing both. Both super easy DIY. With air tools you can swap a spindle in about 5 min. With 2 people, boat off the trailer and air tools you can do the axle in 15. I did it and n 35 min by myself without air tools at the marina. You will need a good floor jack.

[Jpdavi1]

Thanks for the heads up. Looks like I'll be changing them