Lego tank feat. trailer equipped with a differential gear

This is a Tank with a trailer i recently created that I found to be very nice…. the rear axle is equipped with a differential gear to allow auto correcting. this design is very applicable and has ALOT of power o run over dirt, carpet, etc… however in the design in this video the rear trailer should be equipped with another differential axle in the front to allow less drag than a skid plate… please comment, that would be much appreciated.

Duration : 0:4:50

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