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Getting DefaultModelBinder to perform recursive validation with a custom ValueProvider
public class VehicleOrderEditFileModel
{
    [Required]
    public IEnumerable<OrderVehicleEditFileEntryModel> Vehicles { get; set; }
}

public class OrderVehicleEditFileEntryModel
{
    [DisplayName("VIN")]
    [RegularExpression(RegularExpressions.ValidVehicleVin, ErrorMessage = "A valid VIN must be supplied")]
    public string Vin { get; set; }
}

public bool ContainsPrefix(string prefix)

public ValueProviderResult GetValue(string key)