These are highly detailed die-cast model sets produced by M2 Machines. M2 Machines is known for its 1:64 scale models that often feature opening parts, real rubber tires, and accurate details, making them popular with collectors.

Each "Single" in the Auto Haulers series typically consists of:

• A hauler truck: Often a classic cab-over engine (COE) truck, a pickup, or a van.
• A vehicle being hauled: This could be a classic car, a race car, or even another truck.
• A trailer: Either an open flatbed trailer or an enclosed car hauler, designed to transport the vehicle.

Based on available information, here are some of the sets included in Auto Haulers Mix 67:

1. 1966 Dodge L600 and 1971 Plymouth Hemi Cuda (with a "Ramchargers" theme)
2. 1964 Ford Econoline and 1932 Ford Tudor (with a "Maui & Sons" theme)
3. 1973 GMC Sierra 3500 and 1975 GMC Sierra Grande 15 (with a "Pan Am" theme)

M2 Machines often produces "Chase" versions of some of the sets. These are rare variations with different paint schemes, wheels, or details (often gold chrome) and are randomly inserted into cases, making them highly sought after by collectors.