I looked at many used boats before I purchased my Supra ranging from Tige to Mastercraft. All of these boats had some type of gel coat cracking going on. Its not only a "Supra" issue. Most people that use there boat eventually will develop some type of stress cracks in there gel coat.
When I was looking at boats, all of the cracks were around the tower legs and near the swim platform brackets. Obviously these areas take a lot of weight and pulling which is no surprise why there would be stress cracks in the gel coat. If you talk to anyone who knows about gel coats this is purely a cosmetic issue and will not compromise the gel coat/hull/top deck performance.
White/Charcoal, 2011 VLX
2008 Supra 22SSV