I'm the owner of the 5th Gen 4R with the winch that "trentfysty" was showing and asking about earkier this month.
Every offroad parts store I found was willing to sell me a winch for my new Toyota, but they could not find a mount for it. I contacted Winter Motorsports, wintermotorsoprts.com, who had made a set of very nice sliders for the 4runner.
Matt engineered a very capable mount that is an extention of the frame. A major hurdle was the new Toy design of the front end. You can't just take off the bumpers anymore, they are integrated with the side panels. Matt had to design a mount that would extend the frame within the constraints of the new Toyota front end, not an easy task. In additoin to everything else this winch mount is a steel frame that protects all the plastic that Toyota increased on the bumpers of the new 4Runners. Matts engeneering is like art work, perfection as far s I am concerned. I give him an A+ on this winch mount.
It was tested pulling a Jeep up hill for 100'. It did not flex or have any issues with the pull. It was tried again on a resistant load to just about the max. pulling capability of the winch, (a brand new 9500 lb Warn winch). The mount had no problem under this stress.
I am not new to offroading and have been using a winch on my Jeep for the last 15 years. I will soon be taking the new 4Runnner out to the Mohave Desert, Dearth Valley and Arizona and giving it a workout. If there are any problems I will post them here. I do not expect to have any issues with this setup. It was very well constructed not just to look good but to handle any stress the winch can provide.