I don’t know whether the wearing of spurs by team riders was universal but in the Napoleonic Wars the British Royal Artillery drivers do appear to have worn them. In C.E. Franklin’s British Napoleonic Field Artillery he says that in the field the drivers wore “ankle-length boots with boxed, swan-necked spurs”. (Mind you I have no idea what a “boxed, swan-necked spur” looked like). Similarly, according to Lucien Rousselot, Napoleon’s Army 1790-1815, soldiers of the artillery train wore soft riding boots, similar to those of dragoons, initially with detachable spurs but from 1812 with spurs fixed to the heels.