Didn't stop me either, I had one removed from my gelding which was on the girth area and another on the sheath I have left alone. It hasn't changed in 5 years.
I have hired a couple of the equitrek trailers, I think one was the sport (?) and the other the treble axle. As for the horse area they are brilliant. However I didn't find them the best to tow, unstable when travelling solo. I was towing with a Landcruiser.
If you do manage to find her history you can possible get Video of her racing, I managed to get video of my mare from Racetec. I can't rememeber the website but a bit 'googling' should get you there. Good luck