Kelly-Springfield Motor Truck Co was established in about 1910 when the Kelly-Springfield Tire Company decided to enter the truck business,

Wilbur Sandison photographer, circa 1925

The trucks were either 5 or 6 ton, and had about 30hp

http://www.blackdiamondnow.net/black-diamond-now/2016/11/kelly-springfield-motor-truck-company-circa-1925.html

"When Kelly introduced their own water cooled engine in 1912 they became Kelly-Springfield. This was also the year the Renault-style hood with the radiator behind it was introduced also. K-S built trucks ranging from one to six tons. By 1929 Kelly-Springfield trucks were gone."

http://skyscraperpage.com/forum/showpost.php?p=5897109&postcount=10193