1. An attachment system for a vehicle, the attachment system comprising:a lateral member;
a plate defining a first aperture and having a flange that extends at least partially around the lateral member, the flange defining a second aperture positioned to expose a portion of the lateral member; and
a retainer coupled to the plate and positioned to selectively extend at least partially across the first aperture;
wherein the first aperture and the second aperture of the plate are configured to selectively receive an interface of an attachment such that the interface engages the portion of the lateral member and selectively engages the retainer.