1y3m old German Shepherd male Pedigree working line

I am selling my male GSD due to an unfortunate change in circumstances.
He is a big lad at about 40kg. I am now living with my mum and he is too big for her to cope with. He quite often shoulder barges her out of the way. I don't want her getting knocked over again.
So, he is definitely not for an inexperienced owner. He is in the stroppy stage and lets you know about it quite loudly.
He walks on the lead well compared to when I first got him. When I am by myself with him, he is generally good. When I am with someone else he gets very excited and pulls in all directions, all at once.
He has the highest food drive I have ever seen in a dog. Even in an empty room, he will speed eat his food to the point where he chokes some up and continues to eat at full speed. He will do anything for food, which has made training him a little easier. The only way I’ve managed to slow him down is to put chunks of carrot in his food, which he really loves.
So the bad news, he hates his crate. With a passion. It’s only been over the last 3 or 4 weeks this has happened. He ate a sock (one of his party tricks that he has always done since he was a pup) and evacuated everything in to his crate early one morning. Since then, it has been traumatic getting him in there on a night. The only way I can get him into the crate is by putting biscuits at the very back and shutting the gate when he's focused on that.
It has come to the point where it’s either he leaves or we both do. It is really upsetting to get rid of him but we have reached the end of our abilities and time to train him. He would probably suit someone with a farm, where he can run himself silly. I would not be happy for a family with small children taking him. He really is a clumsy thing and would be constantly bowling kids over.
I have all of documentation from the previous owner, I think he has had all of the tests that the vets can do. He has been hip and knee scored, has pedigree lineage and family history. Read more