One of the things that you can add on to a Truck Pit is a Gravel Panel which is just a Tracking Panel that has been modified for use with gravel or sand.  The Gravel Panel can feature ramps, clear tubes, pipes, and chutes to run the gravel through and then have it fall back into the Truck Pit.

Building a Gravel/Tracking Panel is pretty complicated and is generally left to some of the more experienced and skilled carpenters. What makes these panels so hard to build is the high density polyethylene (HDPE) plastic that makes up just about the entire panel.

While very strong (and pliable when heated) the HDPE parts cannot be sanded or otherwise filled to hide blemishes, which means every part has to be carefully machined and cut to fit correctly on the first try. Also, since every screw that holds these parts to the panel needs to have a pilot hole (another requirement of working with HDPE), accuracy is crucial to making sure that all of the parts line up with the panel itself, which has already been cut and drilled on a CNC machine.

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