I'm glad you have called, it is really important. I have looked at quite a few trailers at shows since this happened to mine and believe me, there are a lot of trailers out there with this problem. Sadly they all seem to be the same make!!
I had an older IW and had NO PROBLEMS with it but I cannot say the same about my nice brand new trailer (well it was in Dec 2007).
I had to take my horse to Kent for an MRI scan which involved me travelling on FOUR different motorways and I put cable ties through to top of the pin and secured it really tight so pin cannot come out.
I now have to do this for every journey because I guarantee if I didn't my ramp will come down again.....VOSA DO THEY CARE????????????????
This is not what you expect when you buy a brand new trailer