Well that is certainly one way to do it and if truck use works good for a flatbed not a bad choice. However the box delete on the truck will be worth about $500 if buying new or you can get it with the box and try and sell it and probably get at least that much for it. The flatbed will run at least $2500 and on up to well over $10k depending on what brand what features, matching paint etc. There are some really nice ones out there but those really nice ones can get expensive. Also be aware that some of them well many if not most all will come with a goose ball but not all can accommodate a companion hitch (5th wheel) like in the pic. I know I looked at a Hillsboro bed which came with the ball but it could not take a fifth due to the way the ball was mounted and the bed construction (at least for the model I was looking at). So if you go that route you just want to make sure about that.