I am pretty sure no one makes a steering stabilizer for the marauder. You could probably get a custom shop to adapt a steering damper from another bike if you really want to.
We have a 6 month old. So I attached a sidecar to the Marauder for my wife so that our daughter can ride with us. Historically we rode 2 up now she has the Marauder and I have an Triumph ST need room for baby.