Hi lifter thank you for your comment.

As you have mentioned the top pallet can slip off, but what is the probability. We have loads that we transport for example toilet rolls to pallets of wine. I would consider some double stacked loads to be more stable than most other pallets we transport in the warehouse. I would never train this on a basic course but I have been asked to take part in a risk assessment for this procedue and if it is signed off the training will be trained under specific job training.