According to the calculator, hitting a 300-pound buck at 65 mph is equivalent to the energy of 1.373 x 10 to the minus 5 power
metric tons of TNT, which is 0.0302 pounds, or about half an ounce. Not an inconsiderable amount of 2,4,6,-trinitrotoluene. If you set off 400 pounds of TNT in front of your Transit, the insurance adjuster won't just be asking "What Transit?" She'd be asking "How's the fishing in that lake?"
300 lbs x 65 mph = 57,000 joules. A stick of dynamite provides 1 to 2 megajoules of energy. So something like 1/20 of a stick of dynamite?
Nonetheless, we all can imagine the carnage. I'm thinking about protection where there's some braking involved, so maybe 25 mph and a typical 150 pound doe, which is only 7% as much energy. That happened to my Jeep Wagoneer a few years back. Minor but annoying damage. The question is whether a brush guard would be effective in that situation.
's jiggly light bar suggests not.
The replacement bumpers have brackets that go back to the unibody structural beams. You have to take off entire bumper assembly. I'm guessing "easy installation" is the big selling point for the brush guards, so they purposefully avoid tying to the main structural beam ends to make them "consumer-friendly".