Non veni pacem mittere, sed gladium.
My 1974 Toyota Landcruiser had a bull bar made out of a steel I beam. Front mounted winch and other get-my-ass-out-of-here goodies. Loved that vehicle.
I have an ARB bumper and yes they work. The Aussies (who own ARB) tested them in the out-back against kangaroos, which hop in front of vehicles exercising right-of-way and they have a 100% success rate. It was that rate which prompted me to buy that bumper for my Toyota FJ. And even though there aren't many roos around here, there are a lot of deer. Same same with the bumper. However an elk is a different issue entirely...you need a snowplow to defeat them.