Amidst all the Bentleys, Ferraris, and Corvettes for sale at Hemmings we find this under “unspecified” make:

1968 Unspecified Belly Tank

This Corsair A7 drop tank was expertly crafted into what’s probably the coolest trailer on the road

It has functioning brake and turn signals, and rides on 7.00-16 Firestone Deluxe Champions tied in to TA1000 torsional stub axles.

Tows great empty or loaded. Cutaway pieces from the top are included if the next owner wants them, could look neat hinged?

The trailer was originally modified to haul a small motorcycle, a photo is included that shows the interior dimensions as a guide for whatever you choose to do with it!
Price: $2,750 obo

Price is a bit steep but it needs only a Microturbo engine, a front axle and steering, and a bubble canopy for a roadable Wile E. Coyote Acme-car.