Conditionally validate request fields in Laravel 5

My variable carType gets a string value.

If additionalFields variable is carType should be required when it is a truck or caravan. If carType is a truck, then additionalFields should be a array.

'carType' => 'string',
'additionalFields' => 'required_if:carType,truck,caravan',

How do i add an array validation based on condition?

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