Need help on how thick i should go. 1/4" thick will be about 300+ lbs 3/16 will be about 100lbs less. will 3/16 warp ? the box size is 30x30x24 . my steel guy is trying to talk me into 3/16. i know 300 + lbs is alot of weight but i think if i brace it to the frame of trailer i should be ok. Need your help on this one. Thanks