There is no limit on how high you can lift your wagon. Only time you'll need cert is with a body lift, adjustable suspension or upper control arms. 50mm is just a general safe lift without having to do the supporting mods that actually require cert.
Lift wise head into your nearest autolign branch and ask for trade pricing. Recently got a set of parabolic rear leafs and front springs for my Ranger 300-400 cheaper than anything trundles or anyone else had.
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