Is this the rig?
http://picasaweb.google.com/john.cocking/BigRedTruck
We saw this rig and met the owners last winter at Bentsen Palm Village RV Resort in the Rio Grande Valley. They bought the tractor used from a major trucking company and had it converted to suit their needs. It includes a crane to put the car on the back, and a Harley rides in the toybox. The trailer is a triple axle Escalade.
They bought a lot in the neighbouring Retama Village development, so I expect that we will see more of them this winter. (Their lot is almost directly across the road form Skip and Mary's (Countryfolks).
Ah yes, its getting closer to RGV time!