Did a little experiment today as I emptied my tanks to put in some fresh water.
Van was on a slight upward incline but the figures are still quite meaningful. Starcraft outback 20.62-3.
Two standard 80 litre (80kg of water) tanks. Front one well forward of the axle. Rear tank sitting just behind the rear axle.
Both tanks full. Ball weight (with most of my gear in it) 260kg. (Gets close to 300kg when fully loaded and level).
Emptied the front tank. (Full rear tank). Ball weight went down to 220kg.
Emptied the rear tank (front ball weight increased to 240kg
Summary for my circumstances.
Front tank evenly spreads weight of 80kg thus applying 4okg of weight to ball.
A full rear tank takes only about 20kg off the ball weight.
Hope this is helpful.
Van was on a slight upward incline but the figures are still quite meaningful. Starcraft outback 20.62-3.
Two standard 80 litre (80kg of water) tanks. Front one well forward of the axle. Rear tank sitting just behind the rear axle.
Both tanks full. Ball weight (with most of my gear in it) 260kg. (Gets close to 300kg when fully loaded and level).
Emptied the front tank. (Full rear tank). Ball weight went down to 220kg.
Emptied the rear tank (front ball weight increased to 240kg
Summary for my circumstances.
Front tank evenly spreads weight of 80kg thus applying 4okg of weight to ball.
A full rear tank takes only about 20kg off the ball weight.
Hope this is helpful.