Advice on custom flatbeds

[CarpenterCattleEnterprise]

I would like to hear some opinions on the flatbeds out today. Looking to purchase new steel bed to outfit a f450. Nothing too flashy, just the standard flatbed with fifth wheel hookup, bumper bull, and maybe some toolboxes. Interested in best construction(strength, resistant to weathering and corrosion, tie down locations, and just general work efficiency and convenience). Probably will buy the best bang for the buck, but am willing to pay more for worthwhile convenience. Also, is it worth buying the built in boxes or just customizing tool boxes to the trailer myself?
Thanks yall for input and love the forums since i discovered them last week.
Carpenter Cattle Enterprises (aka rob)