This 40# weight is designed to pair with either the ultimate base plate 20" or the ultimate 20" light duty. It bolts underneath using 1/2" flat head screws in the 2 offset truss mounting holes. While in place this still allows you to use both pipe holes, as well as center mounted 12" truss (using flat head bolts). Additional holes could be added to allow alternate configurations while in place. This part does not affect either base's overall dimensions, so the 20" cart and related accessories can still be used.
Weight will be powder coated wrinkle black by default, shown in pictures red for clarity.