On Wednesday, February 15, 2017 at 11:55:36 AM UTC-5, OHM Ω http://aviation.derosaweb.net wrote:
Yep, I don't want anyone to drive away with my "baby". My old trailer's coupler had a hole in the latch in which a simple padlock can be inserted. The ALKO coupler seems less secure? I have twice sent an email to the Elkhart, IN office's contact address from their web site with zero effect. I am going to have to call them.

I've ordered a lot of alko bits from the uk at http://www.tauntontrailers.co.uk/security-40-c.asp ; likely they have what you need. I usually receive orders within a week, at prices that are highly attractive.