AppleButter

I have a picket on picket 6' wood privacy fence that is bowing out in several spots. It's the 2x4 cross beams that are warping, messing it all up. I'm thinking maybe a buried post with some kind of wire or chain to influence the wood not to warp any further ? It's rainy season, is there any chance/way to get the wood to come back into shape ? Thanks for any helpful suggestions. I should have caught it sooner, but I figure better let they never, to at least try.

I have a 2002 Pontiac Montana with 130k miles, it was pre-owned, I've had it 5 years. The back breaks are squealing a little and grind a bit. I'm looking for best case, worst case and anything in-between on what to expect the costs to be. I'm clueless, probably need the front done too, is there a difference whether it's front or back breaks ? Appreciate any and all info so I know before hand what to expect. TY!