Prior art tiltable cargo racks for supporting large pre-cast concrete structures had a longitudinal arm rotatable from a horizontal loading position to an inclined transport position. An example of such a rack is described in U.S. Pat. No. 5,947,665 to Baur et al., FIGS. 1-4 and the corresponding text of U.S. Pat. No. 5,947,665 are incorporated herein by reference in their entirety. In such prior cargo racks, a plurality of upwardly extending members of specified length was required for simultaneously contacting and supporting respective corners of the structure. Adequate support was not provided in the event that the pre-cast concrete structure had one or more corners at a height differing from the length of one or more of the corresponding upwardly extending members of the rack. Also, adequate support was not provided to prevent unintentional tilting of the rack during cargo loading.
Accordingly, it is desirable to provide a tiltable cargo rack that provides adequate support for the cargo without requiring a plurality of upwardly extending members of specified length that simultaneously contact and support respective corners of the cargo.