Wonder if anyone can help. The above van, which we are viewing, has a flush toilet. It has a largish tank which you can wheel to the emptying place. There is no level indicator so there is no way of telling that it needs emptying. Has anyone had any experience of this kind of system? Also wondering what would happen if the tank needed replacing as I have been told that these vans were never imported into the UK and are quite rare here. Be grateful for any info on these. Thanks