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
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