This DAF truck from 1949 had a roll-out engine bay
Car manufacturers do not always consider how mechanics will get in to fix any of the inside parts of a vehicle. Nowadays, standardized practices have made it more accessible. This truck produced by the DAF-Domburg factory in The Netherlands had a roll-out engine bay to facilitate access to the engine bay.
It was meant to allow mechanics easier access, but it backfired. The engine’s location meant the slip yoke connecting it to the drive shaft had to be about five feet long. That made the drive shaft harder to control and more unreliable, which is why it was never mass-produced.