I've been looking online quite a while at pop up campers (never owned or camped in one yet), going back and forth between new and used (I know the depreciation issue on the new ones, but there's something about being the first owner...) One of the major cost drivers is the toilet or toilet/shower combo. While I'd be OK with an outside shower, the users would mainly be the wife, grand daughter, and myself, so I think a toilet/shower combo would be a good investment. But it looks like the cost difference between a unit with and without a cassette potty/shower combo seems to run around $1500. So I got to wondering about buying a unit with an outside shower and an inside cassette toilet. I could go with a portable, but I like the idea of it being locked down and able to have a hinged cover over it. Then I got to thinking about buying a unit without the potty and retrofitting it myself by installing one in the area lots of PuPs use for a storage cabinet. Has anyone out there done this or know anyone (with either good or bad results) that has? Seems like a way to "keep my cash and potty too", but since I have no idea what I'm talking about I thought I'd ask all you educated folks for your thoughts.