There's a company called Road Armor that makes a bumper that will hold up to Elk, though you're certainly going to sustain damage with a 1000lb-er or a bull Moose. A guy in my neighborhood puts nearly 100,000 miles a year on his F350s towing a 10,000lb trailer to his chain restaraunts in Oregon, Idaho, Montana and Wyoming. He gets a new one every other year or so and always has a new Road Armor bumper put on. I was asking him about the bumper and IIRC he told me he hits a dozen deer and one elk pretty consistently each year and the bumper has only a few minor marks in it. He showed me an Elk's hoof mark and told me that particular animal got flipped up and over both the truck and trailer - it was the most direct center of mass Elk hit he'd experienced. Yes, sometimes the frame horns get tweaked and need straightening but he's never had to stop whatever trip he was on. That's a pretty amazing track record. That's gotta be a body damage savings in the $50,000 range each year. Apparently he is nearly always driving at night all year round.
Unfortunately, they don't make a LandCruiser model. They're also a bit Mad-Max looking. His seems to have some extra tubing even above the ones on the website.
DougM