Cathy, a US citizen can't actually take possession in Canada and bring it through customs. So you can go there for orientation, but ETI has to bring the trailer through customs and you take possession on the US side of the border. At which time you are free to go back into Canada if you so desire.
Know this very well. Been there, done that. And went back into Canada for a big trip through Canada! The post said that their Escape is on its way to Florida on a trailer. I took it that ETI was shipping it home for them even though they went there for orientation.
Actually, I believe that US customers did take their trailers across the border long ago but that gave ETI problems, so ETI does it now.