I towed heavily loaded trailers - stuffed with books, tools, furniture, the trailer was loaded to the roof and I couldn't get up steep San Franscisco hills - to and from Alaska, and across the entire United States.

With an Impreza.

That included highways in the Yukon that were more river rock than gravel, backwoods of Montana and Wyoming, you name it.

It was totally fine. Especially in a Subaru, with AWD and a low well centered center of gravity. I'd do it again.