Beta MD-Series Tandem Axle 2.0

V2.0 is rebuilt using the T-Series tandem axles

Changed
- New tandem suspension: the T-Series walking beam. The rear tandem is now the T-Series walking beam with the T-Series axles, hubs, wheels and inter-axle differential, mounted on the MD frame rails. It replaces the v1.0 tandem, which was two copies of the MD single rear axle
- Differential locks: the interaxle differential lock, plus one Rear Differentials button in the drivetrain controls that locks both rear axles together
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