Yea I have the Gammoh on the fixed gear and it's a beast. I love it but my commute is now a 52km round trip with a few hills with the added bonus of having to drag my bike up 4 flights of stairs when I get into work. The Equilibrium isn't exactly light as it is.
Hmmm..the Equilibrium is 12mm thru axle so that's another thing i'll need to check out.
What did you do instead? Rear rack? Frame bag?