Great Divide with full suspension?

[bokes]

I'm planning to ride the Great Divide, and im having a hard time deciding between a full suspension MTB (Aeon Isis w/ Bob trailer), or an expedition tourer (Thorn Nomad w/ panniers and suspension seatpost.)  Here are some personal criteria...
1.I prefer the feel of panniers over the Bob
2.I've had lower back problems in the past and i'd really prefer the comfort of full suspension. I read about the washboard.
3.However, I often wonder if full suspension is wise because it's one more thing that could break down.

I've read the book "Cycling the Great Divide", but i'm looking for more opinions. Thanks in advance.