Hi pahlow,
Welcome to the Heartland Owners Forum.
Since you're writing about a 2013, I'm guessing you may not be the original owner. Owners often modify their rigs, so it's very possible yours was changed after it left the factory. Hopefully another 2013 Gateway owner can share how their nightstand is placed. If it is different from yours, the next step would be to investigate how yours is mounted and what it would take to get it the way you want.