There is so much to unpack in your comments. I’ve had similar thoughts, I’m sure anyone on here involved in manufacturing has… then reality intrudes!
I suspect the only people who can successfully integrate flatbeds at a reasonable cost are the OEMs. If you think about the entire market for flatbeds, subtract current sales (there are already dozens of small manufacturers and maybe a few big ones), divide into truck brands (different frames), divide by bed lengths, divide by materials of construction…. you very quickly arrive at unit counts in the dozens or low hundreds, with dozens of variants. Now, spend some time reading through threads here and think about how many consumers feel ENTITLED to customization, and are unwilling to do any of it themselves. Add in complaints about everything from scratches in shipping to it didn’t survive when a giant Sequoia fell in it to it got rust after I parked it on a salty beach for 5 years…. Do you still feel like it is a feasible business model?
If I’m wrong, then awesome! You can go into business, great thing about America! You might be the right guy, at the right time, with the right resources…
All you need is working capital, shop space, insurance, employees, supplier credit relationships, design engineers, specifications for all trucks ever made, a web presence, someone to answer emails from customers, times three, insurance, business licenses, legal representation, etc…
I’m guessing that with hard work and dedication you might become a hundredaire in only a few short years.
Those who make it call it a labor of love for a reason. There are far more stories of business collapse and criminal theft of build deposits.