While sitting here on the porch watching my neighbor across the road hauling hay, It occurred to me that if my tt had a steerable front axle like the hay wagon, or the truckers pulling tandem it would...
When in college, I worked at a saw mill that used the 4 wheel trailers with a steerable front axle. You might be able to back one, if you were lucky. Really lucky! Add two, or more, and forget backing.
As an experiment, take your kid's little red wagon, attach it to his peddle car, and try to back it. Good luck! The two pivot points are killers.