I did some more digging into the gelatin thing with R’ Ralbag.
He does not allow regular gelatin. He allows Kolatin, which is gelatin made from properly shechted cows. It also has the OU hechsher on it.
R’ Ralbag was contacted regarding Trident gum, some of which had his hechsher. He stressed that regular gelatin is not kosher, but said a special run was produced with Kolatin in it.