I'm running (2) 1 gallon Roto's on my VStrom. I bolted them to the back of my ammo cans not the front. They are lockable with the setup from Rotopax. Easy to remove.It's possible to run 2 or 3 1 gallons per side with additional hardware(longer bolt).For example 3 gallons of fuel and 1 gallon of water. I have pictures her on Advrider of my setup.
MY GSPD has 9 gallons so it's really not an issue and it gets pretty good gas mileage compared to my Strom.I have looked at various GS setups, why such crazy placements of Roto tanks?
Obsessive compulsiveness always trumps good sense.