any way you can come home for lunch and give him a short run/ play session, or do you know anyone that could? Maybe just a break from the crate for 30 min mid day will help. A dog walker, friend, etc.Sounds like he definitely can't be trusted out of the crate
Sorry forgot to mention - yes I go home every day at lunch or have a dog walker let him out ..
But that still doesn't solve the problem of him living his life in a crate.
Which I don't know how to solve because he's only destructive when i'm not there so it can't be corrected