Believe it or not Trigger gets his share of appearance in The Yellow Rose Of Texas even though a great deal of the film is on a showboat. Roy Rogers is a performer on the boat which I assume is working either the Red or the Sabine Rivers which do border Texas. George Cleveland is the captain and he's hired both Roy and Dale Evans for his show.
But Dale is the daughter of Harry Shannon who escaped jail after serving three years on a robbery charge. He was accused of holding up an express company shipment and he's busted out to prove his innocence. Roy is working undercover for the insurance company and his job was to stay close to Dale should Shannon try to contact her.
Of course he does and of course Roy gets his man. But Shannon convinces him of his innocence and the fact Roy's interested in Dale no doubt has a lot to do with it. Roy does start his own investigation and in due course the mystery is solved.
Unfortunately I saw an abbreviated version for television and while the plot seemed pretty intact, I'm betting some musical numbers were cut from the tape I saw. If you remember Mitch Miller's version of The Yellow Rose Of Texas from the Fifties, the melody is somewhat different, still Roy and Dale do well by the song.
The Yellow Rose Of Texas as a song will live a lot longer than this film will. Still it's not a bad B western and the Saturday afternoon kids loved it back in the day.