Re: Check out this camper
The extra steerable axles would not have to be actively controlled. They could just tag along, just like the front axle of a car does when you tow it with a triangular tow bar. Such "passively steered" tag axles are used on some big semis.
But the van's concept is faulty. Imagine driving over a steep hilltop or big speed bump, or thru a sharp dip like some storm drains and driveway entrances. You'd suddenly be sitting on just two of the axles. Ooops!
Good for Halloween parades.
The "Black Death" pandemic of the 14th century killed roughly half the population of Europe and Asia.
Please stay home until this pandemic is more safely behind us. And wear a mask, properly, when you must go out for groceries. The life you save may be mine. Thank you!