HIGHLY DETAILED MODEL FOR DAZ STUDIO 4.1 WITH IRAY AND GREATER.
DIALS : Select MACK B61 AND TANK TRAILER/Parameters/All
ALL_WHEELS:ROTATION
STEERING:LEFT/RIGHT
LEFT_DOOR:CLOSE/OPEN
LEFT_DOOR_GLASS:CLOSE/OPEN
RIGHT_DOOR:CLOSE/OPEN
RIGHT_DOOR_GLASS:CLOSE/OPEN
SLEEPER_DOOR:CLOSE/OPEN
TOOLBOX_LEFT:CLOSE/OPEN
TOOLBOX_RIGHT:CLOSE/OPEN
If you want to separate the tractor and the tank trailer, delect TANK_TRAILER and drag it out of the MACK B61 AND TANK TRAILER hierachy.
Then use the LEGS:UP/DOWN DIALOG.
6 TEMPLATES ARE GIVEN IN THE "MACK B61 AND TANK TRAILER TEMPLATES" FOLDER IF YOU WANT TO APPLY YOUR OWN TEXTURES AND TO CHANGE THE LICENSE PLATES.