Plastic tent canvass attachment point to trailer

your hybrid was made by Thor of California, which closed down years ago.
it was pretty much separate from the Thor Corporation.
they only made hybrids for about 3 years.

the tent tag is usually sewn in along an inside seam.

have you tried Bear Creek Canvas?
they might be able to help but they may not ever made replacements for your brand of hybrid, since there weren't many made and they are rare animals.