Base (Ballast) Weights have a number of uses.

IHP's New Truss Base (Ballast) Weight's are always in development to make them better and heaver.

Steel Enclosed, Concrete Filled, Ballast Weight used for a number of projects. They weigh in at 1,250 lbs and Measure 36" x 36" x 12" tall or 2,750 lbs and Measure 36" x 36" x 24" tall. Need more weight, bolt them together. Top bolt patterns for both 12" and 20.5" Truss.  Black finished for a "Clean Show Look" when used inside, or outside.

Pictures below are some of IHP's Truss Base Weights.