I load it close to neutral, try to keep it between 50-100lbs tongue. The rear bumper is aluminum and I'd rather not load it up.
When I came up to Vermont from Florida, I drove through the Appalachians with about 1000lbs in the trailer (very rough guess) and a minimum of 500lbs in the car. It was squatting a bit, but I encountered no problems, and still averaged close to 60mpg despite taking a very mountainous route.
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