Need to purchase PDQ! The overwhelming majority of my searches have turned up 14ga. boxes with 12ga. lids. Noy wanting to do this over and wishing to weld the box underneath the steel bed, I've found one that claims to be all 12ga. (haven't confirmed). 2 questions: 1) Any brands that stand out above the other (zillion shitty toolboxes) and are a bit heavier (12ga.) than the rest? 2) Is 15-20% more $$ worth it for 12ga. over 14ga.??