Thanks for all you help. I guess I will just have to 'suck it up' and put it as a learning experience.
The trailer owner WAS a friend of mine and she transported both our horses at the same time to an event. There was no negligence on either part and it was exactly that rubber mat on the side that Dakota mentions that has a scrape in it (visual and does not affect the use of the trailer or security). The owner has been really mean to me since that happened and spreading rumors all over the place including claiming to my insurance that my horse 'is ill and cannot stand correctly in a trailer' (I had the vet check this out a week after the trailering and she could not determine anything).
@ miniMia, I dont have that legal insurance and you cannot sign up while a case is pending...and the owner has it (that s what I meant with Rechtsschutz)
My insurance is willing to pay for the garage repairs that the owner insisted on having (though they would not have been necessary), however the quote the garage gave was higher than what it turned out to be and now the owner is trying with this reduced value claim to get the remaining 230Fr as a bonus basically.
I guess I ll have to stop the thread here, as it will soon be turning into a complaint thread otherwise

Thanks again though! I feel a bit better already.