There's been many posts about chemical toilets.
If you read some in the specific section you will finds lots of info and tips.
vwcaliforniaclub.com
For one it's not an issue keeping it within sight (and reach) in the Cali
Others seem the need to keep it as far away possible ...
If you carry a chemical toilet like the PP i see nothing wrong keeping it in the Cali , within reach and not in the rear.
We use ours when taking a short stop or parked up in citys (even once when stiuck in a trafic jam) so if you store it in the rear/booth you will not have the possibility to use it in urgent needs , and thats is just why you carry one imo. For those urgent needs , if it is not urgent we look out for gasstations or public toiliets.
A other thing i always wonder why is those seem to be so determent to say that no way a PP comes near the kitchenunit or livingarea in theire Cali is how/where do people change theire childerns dipers (if having childeren) ....that would be ok on top of the table , on the glas top of kitchen...? Or does that also requires a pop-up tent ...?
As with many things we all have diffrent views on things and important is that you are ok with it , not what others think.