SSA's DeNike says Port of Long Beach's extension of free time was unfair.
Terminals should be blamed for labor shortages on West Coast, union officials say.
Pacific Maritime Association says slowdown is crippling ports of Tacoma and Seattle.
Port of Long Beach CEO said ports are in a "perfect position" to play this role.
Flexi-Van executive says "misplaced" chassis have aggravated congestion.
ICTSI Oregon says actions against it are "far beyond what other West Coast ports are experiencing."