Boxed plate lower control arms can take a pounding. This plate layout style, where the top and bottom plates overlap the skinny connection plate that joins them, is preferable because it creates an inside-corner weld joint. The inside-corner weld joint facilitates the addition of more filler metal compared to most outside-corner joints. Translation: these arms are strong. Check out the grease zerk fittings at the frame-end bushings. The zerks make maintenance easy and keep squeaks in check.