Those are sides of moose meat in the back of a pickup truck in Alaska, photo taken by a friend of mine while on vacation. Look at the size of those ribs!
I am going to hazard a guess that the new 14.5 WSM is not going to be up to the task.
That's just my opinion, and I'm a relative 'newcomer' around here compared to some others!!
Moose meat is almost fat- free. The taste is quite mild, at least on smaller animals. Cut very thin pieces of a steak, and grill them over very high heat for a few seconds, just salt and pepper added, and you're in heaven!