If I remember correctly, it's on the passenger side about mid ship. Somewhere around where the shower is. Disclaimer: my 34XB is fairly new to me, is currently in storage, and my memory isn't what it used to be.!
2005 Allegro Bay 34XB, W22 Chassis / 8.1L
2013 Honda Fit toad, Demco Dominator & base plate
RVi2 Brake System