I sit just me,or do the rear wheels look like they're Tucked in farther than on a regular wagon? If they used the Toronado rear (straight) axle,it might be a tad narrower that the drive axle of the wagon? The Toronado wheels have a different offset than the Pontiac wheels.
On another note about those airport wagons. I saw on the net,somewhere,a Cadillac car hauler. It had the tandem axles like that. Here,I found some. I guess the others are just trailers. The Chevy truck must have a Toronado or Eldorado drive train.