This has been done in the past by a company called Safari Gard, they are out of CA. Do a search for a member of this forum, xpdnrunner. He owns one of the few T4Rs that the company decked out for the television series Global Extremes. I did a search him earlier tonight after reading a thread on another site. If that doesnt turn anything up do a search of my threads, my first thread was on how to mount a winch behind the stock bumper, someone had posted a pic of this mod. From what I have read Safari Gard is reluctant to do any one time productions without a large sum of money. I have heard of people mounting a Warn winch plate behind the bumper and mounting the winch to that. Let me know what you decide to do, it is a mod I have been interested in since day one. The only thing holding me back is the $ involved to make this mod happen. Here is an article on the Global Extreme T4Rs that were released
Global Extreme T4R