trailer couplers

If the torque on the tongue of the improperly loaded trailer was enough to wallow the coupler and let the ball come out.....

I'd replace it.

...and if it's heavy enough I'd consider paying someone to do it.

My commercially built 5x8 trailer has a 1 7/8 coupler.

Everything else I own is 2".

I have a 2" coupler for it and I plan to do it my self.
Cutting the old one off is going to be a pain.

If it were a car or equipment trailer, I think I'd spend the money to have it done professionally.