A lightweight aluminum ladder frame is sandwiched between the engine's aluminum block and steel oil pan for structural rigidity (media.fcanorthamerica.com)
Aluminum Ladder Racks for Full Size Vans, Minivans / Transit Connect / Pickup Truck fiberglass Caps, SUVs - Never Rust! (shoppok.com)
Holyfield wandered into a Footlocker store, where he was asked to sign a basketball backboard above the counter while perched atop a shaky aluminum ladder. (si.com)