Though you have a 2720, I use to stow the Yamaha in the exterior under bed storage. You could, on occassion, smell fuel near the locker vent, but not most of the time. On cool days, not at all.
After I did the armoring recommendation, I started stowing mine in the truck bed. When I convert to a pair Honda/Yamaha 2000s (my Puma has a 15K BTU a/c), I may start doing that again...
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