Fresh from the Hefty Facebook page...
"And here it is! We partnered with @ss_offroad to develop an aluminum Slimline bumper. Taking our knowledge of aluminum products and redesigning their Slimline bumper we have developed the first Aluminum Slimline bumper for the 5th gen 4Runner. Weighing in at only 19lbs over the stock vehicle weight and don’t be fooled by that, these at every bit as strong as the original steel version. They are available for preorder now. The first batch will ship out in December.
Order now at www.heftyfabworks.com"
Not cheap at $1165usd, but a good option for those not wanting to commit to a full bumper
http://www.heftyfabworks.com