2005 Toyota 4RUNNER body & structure problems

I was pulling into my garage very slowly and when I stepped on the brake, the car accelerated rapidly like it was shot out of a cannon. I went through the back of the garage (sheet rock, 2x4, freezer and other items that were stored in the garage). I was air born and landed about 10 feet from the house with my foot still on the brake. The airbags did not deploy and I hit my face on the steering wheel, injuring my nose and required 7 stitches in my lip. I could've been killed but god was on my side.

Looked under truck to check for rust, found multiple spots with under-body frame rot (rust, could potentially rust through). The rust could potentially cause a major accident. Unsure if previous owner used "fluid film" or similar product to protect the under-body - I recently found out about pervasive rust rot in the under-body of the 4th gen 4runners. This is most likely caused by the salt solution placed on roads to help prevent ice and snow formation.