Trailer ride height

Hi all firstly just like to say thanks to everybody for there help on here me being new driver
I backed on loading bay yesterday and had to raise trailer suspension to level with bay, afterwards how do I know correct ride height for trailer does it correct itself ?

Cheers tony,

Just pull the height handle back out and pointing down at it will level it’s self

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Yes when you pull the black handle you’ve just used to raise the trailer .

blue estate:
Just pull the height handle back out and pointing down at it will level it’s self

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Cheers bud