one -ton this bed is made by B&W Custom Truck beds based out of Humboldt,KS.
http://www.turnoverball.com/
Then click on the custom bed link on the first page. Then just go threw the pages and spec a bed out.
Think hard about what you want a flatbed to do for you. Look at all the other brands on the market. Look at fit and finish on all. Look at the design, is it all square corners with butt welds or edges made on a brake press. . Brake press work takes time in a fab shop. Which cuts into profit margin.
Look at metal thickness used. Look and see the method used to mount the bed.
Something else to think of is if you want tool boxes with a standard flatbed is the aftermarket boxes are 18" deep X18" high X 24 long. These boxes hang down to far when installed under the bed on our size trucks. They also stick out past the edge of the bed sometimes. The boxes on this custom bed are sized to fit into the flow of the body lines better. My front boxes are 14" deep X 28" long X 14" tall. No one makes a behind the axle mount tool box. So on this one your on your own to eather have someone build them or do without. The built ones will most likely not match the front boxes if you go aftermarket boxes. Most of the aftermarket boxes are made of 18 or 20 age steel. In the rust belt I live in this means about 4 or 5 years and they are rusted threw. The boxes on this bed are . 125" thick, (20 gage is . 068" or so).
Most flat beds only offer a trap door for a goose neck hitch that you supply. This bed has a turn over ball hitch as standard equipment which means a flat floor with no lose in floor strength due to a trap door. But if you like the trap door setup it is a option. I didn't want a trap door. They rattle after the get some age on them. The hinges rust up making it hard to open them if not used often.
I guess the best way to explain it is to tell you to sit down and think hard what you want a bed to do.
What is the finished look you want for the truck? Do you want exposed frame rails and suspension? The side skirts and boxes cured that on mine.
Do you need square corners on the rear of the bed or do you need clipped corners for trailer clearence?
Do you need or want a large amount of onboard storage?
Do you want a light weight bed or something that will last longer. The rule on flatbeds is a light weight bed will rust out faster. The cheaper light weight beds weight about the same as a dually bed. My bed is around 1,200 to 1,500 lbs. The way the truck drives. I think its closer to 1,500. I'll get it scaled soon to find out.
As far as price. Go threw B&W's bed options and you can figure out what I payed. I don't want to put a lot of people into sticker shock. :-laf
This makes dually #6 I have owned in the last 25 to 30 years. This is the first custom flatbed I have bought. This bed as far as options for its use blows away any other flatbed I have had on a truck.
Like DieseMan359 stated. The pic's do not show the fit and finsh that the bed has. It is a top notch built bed. I work in a metal fab shop. I would be hard pressed to match the quality that B&W put into it.
Attention: TDR Forum Junkies 
Plus, function. 
A pair of 6" turnouts would look 
