I've had some live traps and raccoons opened them because they were made too light.  I found a place in Iowa that makes heavier gauge wire traps and you can talk to the owner/manufacture.

I got one from him and it's a solid trap, nothing has gotten out of it or damaged it.

He did suggest a different trap than the one I bought if you had skunks, but my problem is always raccoons.

"The 6” PVC tube limits the skunk’s ability to lift its tail to spray The enclosed confines of the tube keeps the animal calm and prevents the user from being scratched, bitten or sprayed. "



http://www.ztraps.com/

I think it's best to call him as I'm sure his website is out of date.