I know they are rare. If you see any model TRK RCA prewar projection TVs for sale, please let me know.

I've actually never seen a pre-war RCA projection TV. There was often prototype sets made and found pictured in old publications, but nearly all of them are long gone. I've seen an old photograph of a TRK-12 or 120 fitted with a projection screen, but I believe that was a post-war conversion. The massive, high-end 648PTK was the first RCA production projection set. Even those are very rare.

I don't think any survive. The only ones that were made were prototypes, in very small quantities.