Patent ID: 7210277

Claim:
An apparatus comprising: a first blow-molded plastic panel including a first side, a generally opposing second side and a hollow interior portion formed during the blow-molding process, the first side, the second side and the hollow interior portion forming part of a unitary, one-piece structure, the first blow-molded plastic panel comprising: at least one row including a plurality of depressions on the first side of the first blow-molded plastic panel; at least one column including a plurality of depressions on the first side of the first blow-molded plastic panel; at least one row including a plurality of depressions on the second side of the first blow-molded plastic panel; and at least one column including a plurality of depressions on the second side of the first blow-molded plastic panel; and a second blow-molded plastic panel including a first side, a generally opposing second side and a hollow interior portion formed during the blow-molding process, the first side, the second side and the hollow interior portion forming part of a unitary, one-piece structure, the second blow-molded plastic panel comprising: at least one row including a plurality of depressions on the first side of the second blow-molded plastic panel; at least one column including a plurality of depressions on the first side of the second blow-molded plastic panel; at least one row including a plurality of depressions on the second side of the second blow-molded plastic panel; and at least one column including a plurality of depressions on the second side of the second blow-molded plastic panel.