I am not sure, but the only post I have seen about removing the propane tank was on a SE or Apex. These have the long, small diameter tank that goes all the way across the coach. Doesn't your coach have the tank that is about 3' long and 18"+ in diameter and in the compartment just behind the drivers front wheel? It can only be accessed from that compartment door. I have seen posts about adding storage under the tank on your style coach.
That said, I can't think of any reason for you not to remove yours and install a smaller tank.
Here is shelf added to your type coach.
Here is the post I think that you were looking for.