As noted a tank drive makes the connection to the trucks in the fuel tank, hence tank drive. In addition to Sunset Key uses the tank drive system for it's diesels. Another horizontal drive system was used by Overland wherein the connection between the axle gears and the motor is done in a tower attached to each truck near the pivot point attachment between the truck and the chassis. A third method, used by Midwestern, is to put the connection just above the floor of the chassis. Erik at Midwestern has been doing these type of drive updates for many years and is how he got started. This makes it possible to add detailed entire nteriors and maintain a functional drive system. For the foreseeable future it's either the vertical drive, the tank drive or Midwestern's. It depends on how big a deal it is to you and how much you are willing to pay, or not pay, for it to make a difference.
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