MDC FORBES 12+, Owner'S Manual

Page: 24 / 116

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Ball Weight
When loading your camper, the generally accepted tow ball weight once loaded is around 10% of the total
weight of the caravan. Use a ball weight scale to identify the ball weight and load the camper in a manner that
achieves the desired weight. Ideally, once loaded the first time, take the caravan to a weigh bridge, and measure
the total weight loaded including the weight on the jockey wheel. When the total weight is known, adjust the
load locations to meet the desired balance considering 10% is the generally accepted benchmark.
Effects of Weight Distribution
The distribution of weight in a camper can influence the handling and performance. Overloading the front or rear
may cause adverse handling and sway. Additionally, overloading the front or back can induce a pendulum effect
that can cause dangerous sway and cause an accident.
Tyre Pressures
Tyre pressures have a large effect on the handling of your caravan. Tyres that are under the recommended
pressure for the caravans’ actual weight can cause a dangerous sway. It is important to follow the correct
pressure guide. The guide below indicates pressure for the ATM which includes ball weight of 10%. Pressures are
cold inflation applicable to the standard Goodride 265/75R16 tyres fitted.
Actual Weight
Pressure PSI
Single Axle
Pressure Kpa
Single Axle
2200kg 57psi 393Kpa
2300kg 60psi 414Kpa
2400kg 62psi 427Kpa
2500kg 65psi 445Kpa
2600kg 67psi 463Kpa
2700kg 70psi 480Kpa
2800kg 72psi 498Kpa
2900kg 75psi 516Kpa
3000kg 77psi 534Kpa