https://www.oldsouthcarriage.com/about/our-carriages/

In 2014, Old South Carriage put a contemporary twist on our horse-drawn carriages. We began converting our fleet of wooden carriages to a carbon-fiber composite material similar to that used in Boeing’s 787 jetliner. Our reasoning? If it’s good enough for Boeing, it’s good enough for us! The result is a lighter weight, more durable carriage which requires much less maintenance than its wooden predecessor. With this innovation, we successfully increased the level of comfort for both our horses and passengers while preserving the look, feel, and authenticity of our original carriages.

"The Amish Horse-Drawn Buggy Is More Tech-Forward Than You Think: The tech inside this 19th-century conveyance isn't stuck in the 19th century." https://www.popularmechanics.com/cars/car-technology/a24666/...