The tow ball and tare weights are only a guide and will change depending on accessories that are fitted to your van. it is advisable to discuss this with your Jayco representative. Jayco allow an amount of additional weight (Carrying load) for each individual unit manufactured above the initial manufactured Tare weight of the unit. This ‘Carrying load’ is for the customers individual weight requirements and can be made up of ‘any’ additional weight they propose to load the unit up of. ie water, food, clothes etc. The standard unit carrying loads Jayco apply are; Single Axle, internal shower units 375kg. Tandem Axle, internal shower units 475kg.