You need to talk to "Hogtownboss" or "PaulChristenson" here on HTW.

http://www.horsetrailerworld.com/forum/thread-view.asp?threadid=12891

 LB's in Harmony, N.C. has flat beds, You'll find a few listed in the truck section here on HTW or Working Truck World.

Blue Ribbon Trailers in North Jackson OH, build custom bodies and trailers of every description. They use excellent products and have exemplarily build quality.

Call Thomas "Chip" Ashcraft, Blue Ribbon Trailers, LTD. 330.538.4114 330.538.4116 - Fax

Not sure where you are located but here is a use one I found on cragslist in VA.  I just copied and pasted the listing.  If this bed is a regular flatbed and not a skirted bed it will work on your Dodge.  A skirted bed from a Ford or GM will not work.

FREEMAN,VA.- CM brand truck bed , it is like new I bought it last year to go on my f350 but sold the truck and the gentalman didn't wont the bed , I have no need for it , It has 4 delta tool boxs under it a 5th wheel , all led lights, this is a dot approved bed , if you look it up just the bed alone is $1,300.00 . i have a way to load it I will deliver for a small fee , you have to be able to get it off my trailor, for more info call after 3pm 434-294-1570 thanks.

Hope this helps. 

I have the CM SK hauler bed and will not buy anything else.  They are also powder coated beds.