Never had a problem with the Rotopax mounted on the top-box. I use either a one gallon or two gallon depending on the trip. Just gives me that little safety margin as Goliath can get a bit thirsty when loaded. Hot or cold - They have never vented or leaked when mounted flat. They will expand ever-so-slightly with the sun which can make the screw-down fitting hard to release, so I made a 'spanner' to help turn the locking handle.
2002 R1150GS Adventure
IBA # 39193
MIXR screwed with this post 10-06-2012 at 02:47 AM
Reason: Info added