Controversially responding to all this toilet talk and without going into your private habits,I have to ask if anybody genuinely uses their Porta-crapper on a regular basis.My last vw was a conversion with a cassette toilet in the back, bought because we MUST have and NEED that feature, never used the thing. Sold the van and I started dragging a portable version around in the California, it has had lots of very nice vacations and done thousands of miles.It now resides in the garage, the epiphany came when my wife said "if you think that you are going to take a dump at 5 in the morning downstairs when I am sleeping up top, you can think again !", so Britstops is out . Just saying, unless you have some medical complaint, do off-grid camping or have kids, do you really need to drag this thing around Europe?, you can get loads of beer in the FREE space you have just created...........