2 Used concrete bin blocks. Dimensions: 30" high, 48" long, 36" wide. They have a rebar eye for lifting. Estimated weight 4500 lbs each. You will need a way to load them. I can move them a little, but I can't pick them up high enough to put on a trailer. Search terms: Masonry supply, concrete, brick, block, cement, wall material, retaining wall, barrier, rock, fill