I fitted a Trailtech Vapor to my 28 and it works a treat and looks great too. I run the 010 card and was not that bothered, however the local DVLA were and made me fit it. I am actually glad as I do use it

Will take a piccy tomorrow if you are interested, took about an hour to fit which included making brackets for it. It is connected to the battery but doesnt drain it with fairly low use.
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Lemon owner and lover