I suggest that you check out some of the sponsors of this site, as well as other Suzi sites (pirate4x4, off-road.com, Izook, etc.). Their web sites will provide a low down on the bumpers.
May I make a suggestion: look into a winch cradle to be able to mount the winch in a hitch frame mounted front or rear. Since you are a 'rescue team', you would want to be able to get yourself out of a bind, rather into a bigger one. Using a winch that is multiply mounting is advantageous, but also troublesome, especially when trying to move it once stuck. Anyways, just a thought. Don't forget a come-along with chain if you mount the winch solidly up front. Use the come-along and chain to pull the Sami backwards out of the perdicument (?sp).