The horse stopped so suddenly that he sat down on the Singletree, and broke both the shafts of the wagon.
"Out of Doors--California and Oregon"
J. A. Graves
He rose in his britching and then the other end of him come up and he acted like he wanted to set down on the Singletree!
"The Just and the Unjust"
Vaughan Kester
They sprang forward, and disengaging themselves with a jerk, by pulling out the staple of the main Singletree, they set off at full speed with the Singletree rattling at their heels.
"Stage-coach and Tavern Days"
Alice Morse Earle