In the illustrative embodiment of FIG. 6B, the spring portion 1130 comprises a plurality of planar sections 1135, each planar section 1135 extending at an angle from an adjacent planar section 1135. More precisely, the spring portion 1130 in the illustrative embodiment of the front left attachment member 1100 of FIG. 6B comprises three planar sections 1135, each planar section 1135 extending at a right angle from an adjacent planar section 1135 and/or from the frame attachment member 1120 and the rack attachment member 1140. In this embodiment, a portion of the frame attachment member 1120 and a portion the rack attachment member 1140 are laterally aligned. The spring portion 1130 may comprise a different number of planar sections 1135, and the planar sections 1135 may extend at different angles from adjacent planar sections. Additionally or alternatively, the spring portion 1130 may comprise non-planar sections such as sections defining circular arcs. Other alternatives of the spring portion 1130 may be contemplated.

It is contemplated that the spring portion 1130 may be omitted in some embodiments. For instance, in such embodiments, the rack attachment portion 1140 may be continuous with the frame attachment portion 1120 (without an intervening spring portion therebetween) and the rack attachment portion 1140 and the frame attachment portion 1120 may lie on a common plane.

Furthermore, it is contemplated that, in some embodiments, the front left attachment member 1100 could comprise two or more components interconnected to one another.