I flew on a Twin Otter for a summer dropping water on fires some years ago. It's a LOT better than being on the ground. The turbulence is kinda cool after a while, but the pucker factor of coming off a short lake trying to dump flaps while 2500 over gross was what really used to get me.
It is true that the fire makes it's own weather. The rising hot air leaves an area of low pressure which needs to be filled by the surrounding air. The rising air and the area of low create some pretty cool shear.
I'm not familiar with this version of the 130, but it is normal to have fuselage tanks. On the Otter there was 2, front and rear, as well as the outboard and inboard tanks on the wings.
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