Hi folks, was wondering if anyone can tell me where a good earthpoint is on Vauxhall Vivaro hihgtop as it’s Campervan and I want to install a split charge relay, the leisure battery is next to the back right wheel arch which is in a cupboard but carpeted, Thanks Wullie.

It is advisable to try to get the earth point as close to the vehicle battery earth as possible.
Alternatively, a good clean chassis earth is acceptable but maybe consider running an insulated earth cable through to the battery and at least you can tap into it any point in the van to obtain a good reliable earth for items in the van that are high current consumers. 

Thank you for the reply.