hi i just purchased a 1984 chevy rockwood.i paid 2000 dollars.mechanically it runs and drives fine.i noticed that the sides are soft in some spots under the aliminum type siding.you can push on those spots and it moves in and out.is this rot underneath.if it is is it dangerous?how would i fix it if it is?how much approximately would it cost to fix.it is going to be used at motocross races so im not too concerned about cosmetics.i just dont want to have a problem with it falling apart while im driving.i dont even know if that is possible.your help is appreciated.