Thanks for the welcome.
even if i installed a relay the relay requires still a feed from from the battery.Looking at 30amp to go the caravan.
does navara come out with an auxillary box or wiring harness that gets added to existing wiring harness near battery for extras?
Hello JT and welcome to the forum, the answer to your question is to work out the power you are wanting and add a relay to draw power to the trailer!! are you sure you want to draw the power that way? if so, you are talking about drawing a lot of power from the Nav!! i would suggest an extra battery like a leisure battery to substain a regular draw for living appliances in a caravan ect!
Can you elaborate what you want?