Hey guys I'm looking for a little advice. I let a friend of mine borrow my landscape trailer today. Its a 2005 16' PJ trailer with a 2" Bulldog coupler. Somehow it popped off the ball and after looking it over it appears that the hitch has worn substantially enough that the pin no longer kept the coupler tight enough to keep it on the ball when he hit a huge bump. My question is what is the expected life for one of these couplers as far as wear and safety are concerned. What do you do when one wears out? replace the hitch, adjust something....... I estimate this trailer has about 20,000 miles on it over the last 2 1/2 years. Thanks for the help guys.