Artillery Limber

Four pin Lego bricks.  Cut the pins off.

Sand down the blocks and glue paper thin plastic over the block.

Trim the edges.  Use Plastruct Plastic Weld, works great on Legos.

Use Evergreen Plastic angle pieces 1/4 inch sides and cut to the length of a Lego brick.

Glue them to the bricks like this photo shows.

Glue the wheels and center pole from a HaT Industrie Napoleonic wagon onto the bottom of the brick.

And you have a generic limber that will work for the last 200 years.