In no particular order:

  • King pin coupling is inefficient (too heavy, big, and not sufficient articulation)
  • Goose neck auto lock coupling is expensive and inconvenient to use
  • Most local goose necks are built for flat trays not tubs
  • Wheels on US 5th wheelers are too far forward
  • Not enough clearance between vehicle and van to hang motorbike
  • Bed room over neck makes van far too high
  • Generally CG (Centre of Gravity) is too high
  • Chassis mostly not suitable for gravel or dirt road
  • Too much space wasted with seating which is not required for 2 people
  • No real office area
  • Designs are old fashioned and dull
  • Cheaply made interiors and appliances are low quality
  • Similar points as for caravans regarding the interior
  • Also only limited electrical system
  • Most have simple leaf/axle chassis and also rarely disc brakes