Been there since new. When you go down thew road, there is a persistent and annoying squeak the comes from the back...

I've tried everything from lubricating the rear spring shackles to silicone spray on the door weatherstripping to adjusting the rear latches... nothing helps.

Interestingly, when it rains, the squeak vanishes only to come back on sunny days....

It's been forever and I cannot figure out what is is...

Any ideas?