An alignment device is disclosed use in maintaining the alignment of
longitudinal frame members of a trench-forming assembly. The alignment
device comprises a cross member. Extending in the same direction from
opposite ends of the cross member is at least one pair of first lateral
extensions. The pair of lateral extensions is spaced apart so as to
contact the respective longitudinal frame members of the trench-forming
assembly, and thereby maintain the two frame members at a distance
relative to each other. The alignment device may further include at least
one interior extension extending from the cross member in the same
direction as the pair of first lateral extensions. In this embodiment,
the interior extension defines a slot between the interior extension and
at least one of the first lateral extensions, where the slot is
structured is to receive at least a portion of one of the longitudinal
frame members.