
Not sure why anyone would want them in an RV.
For an RV, it sounds like an accident waiting to happen. IF and I am saying IF you could find a way to tie them into your fuel system, they would bounce around in turbulence and break the line, fitting, or the bag itself and have fuel all over the cockpit.
The stock fuel in my RV-6 with Constant Speed Prop give me 5-hours plus endurance with NO RESERVE at Cruise Power.