Too narrow of leveling blocks or improper tire pressure kills tires.
Take photos of the damage and the tire and send them to the tire manufacturer. They should take care of replacing the tire and damage to your trailer. Only send the tire for manufacturer inspection if you can get a written receipt when the tire arrives at their facility. Be sure to document the tire serial number from the sidewall if it's still readable. Otherwise take lots of photos of it.
If the tire company won't fix it, here's how I would repair the damage for an inexpensive fix.
I would use a membrane material available at the local building supply to fix the rip in the material. The membrane is used to line shower pans. I would glue it in place with silicone adhesive and then staple it like the TT manufacturer did.
For the fender, if you can get to the fender from the inside of the trailer, it looks like you could use sheet metal and rivets to pull everything back together and then caulk the seam from the outside to help waterproof the repair.