The best replacement for flatbed is van.

The best alternatives to flatbed are rated as following:
★★★★★  van
★★★★  film scanner
★★★★  dry van
★★★  step deck
★★★  reefer
★★★  dedicated film scanner
★★  sheetfed
★★  turntable microwave
★  flatbed
★  tow truck
★  adf
★  stepdeck
★  tanker
★  portable scanner
  drum scanner
  drum scan
  drum scanners
  all in one scanner
  dedicated scanner
  sheet fed
  cis scanner
  portable scanners
  film scanners

Your alternative for flatbed is not listed? Suggest!
Speaking about flatbed, one probably shouldn't forget about moffett.

Other search terms related to flatbed and their ratings are:
★★★★★ moffett
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flatbed
van
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