I have the Cruiser Medium, it fits well and you sit into it, rather than on top of it. The sides hang over, but you need the front-to-back length to fit the curve of the Tenere seat.

Then again, when I bought mine, there wasn't the same choice as there is now.

With the AirHawk you only have it slightly inflated, the idea being to fill the gaps with air but your ass still sits on the seat, so it's not a problem having bit overhanging, you just set it so it's full of air in these bits and you get a nice arm chair feeling

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Never underestimate the power of stupid people in large groups.