Presented is a selective active caster steering apparatus for a maintenance apparatus having a first drive unit and a second drive unit. The selective active caster steering apparatus may comprise a caster wheel frame defining a caster swivel axis and a caster spin axis; a caster wheel operationally engaged with the caster wheel frame such that the caster wheel is adapted to be steered about the caster swivel axis; and a first caster steering unit adapted to selectably apply an amount of active torque to the caster wheel about the caster swivel axis as indicated by a first formula. The first formula may determine the amount of active torque to output as a first function of one or more measured parameters.