The driver towing the caravan wants to turn right onto the dual carriageway. What should they do?

Explanation: Before turning right onto a dual carriageway, you must assess whether the central reservation is deep enough to contain your vehicle. If so, you can cross into the central reservation when it's clear, and wait there until it's safe to join the carriageway.
If you're towing a trailer or a caravan, the combined length of your vehicles will probably be too long to sit safely in the central reservation. So, you must wait until it's clear in both directions before joining the dual carriageway.

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References: The Official DVSA Guide to Driving: Section 8