I have a Anglo Marine services combi trailer which recently the mud guards fell off whilst I was towing our wayfarer. It put rather a nasty hole in our boat. So if you have one of these trailers check the the piece of angle iron that attaches the mudguard to the body of the trailer. On our trailer this piece of metal seems to have fatigued and cracked. I believe this is due to it vibrating and being held by a single bolt to the trailer.