Larry Printz has a nice write up: From buggies to buses, the first Black-owned US automaker did what few others dared. It's worth a full read for many reasons. . .
"The wood used was seasoned for three years in the company’s yards, with ash frames and poplar panels. Bodies weighed as little as 30 pounds, yet boasted a 600-pound payload. Shafts were constructed from black hickory, and the wheels came from elm and white hickory."
Hope we've kept this knowledge around somewhere.