In general the act of towing itself and both securing the object you’er going to tow as well as the trailer itself can be very dangerous (if you don’t know what you’re doing) This is especially the case if you have never towed anything before. Even if you DO know what you’re doing while towing, you still have to keep in mind the other idiots on the road who don’t know how to drive. For me, on average towing is rather uneventful.

As for the Expedition? Is it dangerous that it can tow 4,000lbs more than its own weight?

For sure no.