This cable - LAPP-21907 - LAPP Olflex Cable, Control Cable, Ethernet Cable & Cable Glands - would suit well. It can be found in 1.0mm and 1.5mm conductor size at times, but is not always available. The 7 core shows as available in the larger conductor sizes - will you be using all 12 or just need the basics? The 7 core should suit too if you just want normal lights and even the convoy light. If you want fixed 12 volt to the trailer and the extra earths too, then go for the 12 core.
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