Factory options for second battery charging?

rod_vw

Lifetime VW driver since 1968.
Guru
We’re maybe ordering a new bespoke LWB Auto Crafter or TGE to replace our current one. I am researching the factory options for second battery charging WITHOUT factory fitment of a lead acid second battery. The Volkswagen Body builder guidelines document talks about various options including lithium charging and maybe a second alternator. I am aware that a Grand California and some of the Knaus campers built on the Crafter / TGE chassis have a switch on the dash for what I believe is enhanced charging,
Has anyone got knowledge of these for use in our world of camper building? If so the relevant PR (option) codes would be helpful.
 
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