Make sure you have a trashcan big enough to completely submerge the trap into. I made that mistake once.
Also, understand the havahart only works when horizontal. When dropping into a trashcan of water you have to insert rods so the doors don't open. I made that mistake once too. Enter trap trained raccoons.
Eventually, you'll have to go to leg traps as they become trained not to enter the havahart.
How about a metal roof. Galvanized roofing panels you can bolt or wire together. They can't chew through that. I bought mine used on craigslist for a song. And I don't sing that well.
Tyvm! I will look into metal roofing.