Me and my son put a 1/4 on this one saturday. This is after all the foam was cleaned up. The bedsides are just as thin as the 1/4 pnl.
The new Z-28's are even thinner. The 1/4 will bend if you pick it up by yourself it will not support its own weight. This makes my job real fun.
Its probally cracking due to stress and being to thin to start with.