Strange thing

[Classicgas]

The trailer in the 68 coronet kit has no outer wheels. Inners and and tires but no wheels unless you use the mags.

[stavanzer]

Yep.

You are meant to use which ever wheels you don't use on the car.

I think it an odd choice.

I presume that tooling costs, or parts count limitations dictated that choice.

I  hope that future issues of the trailer get dedicated wheels.

[CapSat 6]

The original annual kits that the trailer came with (‘68 and ‘69 Coronets, ‘70 Challenger) were the same way. You always had to use whatever leftover wheels were in the kit after you built the car. 

Skinny tires, steel wheels and maybe small plain round “Moon” style caps would be the ticket for the trailer. I’m building one now and found some old junk tires and wheels for mine.