Looks like the
Trillium 4500 is pretty
light, generally under 2000lbs? 240HP should be enough for that, even going up some mountains. Since it's a turbo, you won't lose nearly as much power at altitude as a normally aspirated motor. Your main concern probably won't be power so much as having adequate cooling on the motor and transmission. Since it's rated for almost twice your trailer's
weight, you're probably in good shape there.
For comparison, My Highlander towing an
Escape is about 32lbs being pulled per HP and it's quite adequate at sea level. Climbing a mountain above 10K feet, it's closer to 49lbs per HP which wasn't enough to go over something like 50-55. Not awful, but I was definitely in the right lane with the semis and not passing them. You'd be at 27lbs per HP or so and probably ~30lbs per hp at high altitude (this involves a lot of guesses/assumptions), so still good enough.