Sancti, Robert died 8 Apr 1853 in Baltimore, according to the Find-a-Grave website. I'm searching for the original cemetery records to find more information. There is no gravestone, but the memorial on the website lists his full name as Robert Fields Linthwaite Tudor (I think a lot of the Toder family changed their name to Tudor after they emigrated. Or the recordkeepers just recorded it that way.)
David, I don't think Mary J Toder and Mary Linthwaite Toder are the same person, and there may have even been another Mary Toder who was married in 1822. I get the impression that there were other family members on board the ship, maybe cousins, etc, so there may have been several Mary Toders. I've requested a copy of the passenger list, so I'll let you know when I have more information. In the meantime, I'll try to find the records for Baltimore Cemetery and see what they show that isn't on Find-a-grave. It's also possible that Robert and Mary were born in England, not Scotland, but I haven't had any luck searching England records either. I'll let you know when I have more information.
Thanks to both of you for your help!