Think, for a moment, about the breaking strength of your trailer safety chains.
Will those chains hold the trailer if it comes off the hitch ball? The law says they must.
Now think about the amount of force that will be applied to those chains if the tongue falls off the hitch ball, and the brakes are actuated with full voltage. Will those chains hold that force?
How about the mild steel loop that the chains are attached to the trailer tongue with? Will it hold?
How about the attaching point at the vehicle end. Will it hold against full brake application?
Think about it.