Bud Built provides a complete skid plat set for the FJ Cruiser. The skids provide a smooth serface from the engine all the way to the back of the fuel tank. There are a number of people that have found these skids to be very functional.
Price: $900 for full coverage.
"Replaces both stock thin sheet metal with 3/16″ thick LASER cut steel, CNC press brake formed beef! 3 pieces bolt on to existing mounting points with no welding or fabricating required. Recessed, flat head and carriage bolts give a nice smooth bottom. Only a small drain hole for changing oil interrupts that smooth surface. Rocks, stumps, and lesser vehicles have nothing to catch on. Edges are formed for strength and rigidity with gaps to allow for ease of cleaning and mud removal. Front cooling slots and flow deflector engineered for maximum airflow and maximum protection. Fits around stock cooler mounts and factory crossmember braces! No need for removal or relocation. :)"