Like I think was mentioned earlier, no 'health issues' with using the tanks and having "stuff" in them and being in the living space in general.. Yes, you do still have to have them intact and have functioning plumbing in general... (ie: proper ventilation, no leaks, etc.)
But, you then do have to DUMP the grey and black tanks.. That's where you are going to be the closest to the nasty stuff..
Your fresh water tank is just that.. Fresh water, so depending on the source of your water and if you sanitize it or if you even elect to 'drink' from it, that's really up to you..
Since the OP mentions some physical limitations to even going to the parks facilities, I'd have to wonder about the ability to go thru a dump process??
You still need to basically have some physical ability to do the routine things that make up setting up and breaking down a campsite.. Be that a full hookup site, or some primitive site..
Good luck! Mitch
