atm vsProtected against: 1 ATM: Can withstand depths of up to 10m (33ft) Wet weather conditions and splashes: 3 ATM: Can withstand depths of up to 30m (98ft)In Australia and Europe, the ATM and the GTM can be the same number. 3500kg at GTM is not the weth but a measurement of D-value. Payload Capacity. Payload is the trailer’s carrying