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The set uses a cheater rubber wheel to move both the tracks in one direction. I had this intricate system implemented that used two rubber wheels so you could move the tracks in different directions to turn. But it turns out my rubber wheels were either too big or too small to make it work, so i reverted the system back to stock. One day i'll find some good wheels to use my own system again.
I also modded the cabin to seat two minis side-by-side and gave it working doors.
Then i added an old actual working winch with a crank to the back, plus some lego boat weights to counterbalance the weight from the cabin and move the centre of gravity to about above the centre cheater wheel.
Best 29,99 eurodollars i spent on a set in a while.