Should I earth my AC200L in my van/rv as per the image?
I use my AC180 in my caravan all the time, primarily microwave use. I don’t earth it to the van or when on grid, similar to when I may need to use my petrol genny. Any primary danger is usually a fault in the appliance you are powering, not the supply.
I’ve never had an issue.
That said, if you feel the need, running a cable from the ground terminal to the van chassis, won’t hurt. I’ve also checked this with a multi meter, when connected to the grid, all of the output earth pin sockets of the power station are earthed via the charging cable earth at the input.