I assume it isn't a big deal but today I noticed two small cracks one on both sides of the body just behind the door on each side. (thinking this is where the body would flex when putting the body on or off. I've only taken the body off once and that was when I started working on the frame / panels. In the pic below it may not be that noticeable? The crack doesn't extend underneath where it's glassed...so my plan is to clean up the glass area underneath and reinforce that area with some more fiberglass...right approach? This happen often? My only concern is whether this will keep happening during future on / off's?