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The round 2x2 brick fits into a hole in the bottom of the trailer. This matches the design I use on my tractor-trailer rigs. The front end of the trailer's undercarriage locks into the 2-stud-wide gap between the support struts at each end of the lower area, preventing the trailer from tipping or rotating off the side of the car in normal use.

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© 1999-2006 Tony Hafner