Inside Rotopax mount?

[LJDC]

I would caution against mounting a Rotopax for gas inside the cockpit if your travels include big altitude changes. I live at sea level and routinely drive over 10k foot passes. The Rotopax blow up like a balloon when I do this. If the cap is on very tight it will generally hold the pressure without bursting. If it were clamped between other articles that do not allow it to expand I imagine it could burst. The only solution I have found is to leave the caps loose when altitude change is involved (which makes a mess) or leave them empty which is inconvenient. So mine are mounted outside. I have one for water inside and I don’t worry about tDi

I thought at some point there were self-venting gas caps. I wonder if there's a version for the RotoPax. That said, except for short and absolutely necessary trips (like, I just ran out of gas on the side of the road), I would not carry gas in the passenger compartment at all, elevation or not.

I'm carrying water to feed a half-sized WaterPort (I can't fit the larger one).