I have a Northstar with a cassette toilet. Here are some thoughts on it...
1.) If I had a big camper on a dually truck with slide-outs and such I would probably have opted for a nice large black-tank. However, with a smaller unit like a pop-up (or my own Arrow-U), a cassette toilet becomes a much more reasonable choice.
2.) The cassette's small self contained size is the winning issue in a smaller Truck Camper unit.
And remember the Thetford Cassette system does NOT require a fresh water supply (other than it's own 4 gallons built-in). It is truly self-contained & independent!
3.) A cassette toilet does NOT need a heated environment to function properly. This can be a life-saver when winter hunting or fishing with a pop-up in very cold climates.
4.) The removable cassette unit is actually a small version of a typical 'blue-tote' complete with built-in wheels so it can be "toted" to the dump station if you do not wish to break-camp and drive your entire rig to the dump station.
5.) You can buy and carry extra cassette tanks if you feel you would need more capacity when you travel.
6.) Stinky-slinky hose adapters can easily be made to create a fully closed dump into a dump-station exactly as you would with a regular black-tank camper. I personally do NOT ever 'open-pour' sewage! With hose adapters there is no need to.
NOTE: Tomorrow when I have more time I could post pictures of the adapters and "closed system" I use with my Thetford C400 cassette toliet. Also note that Thetford markets a fine selection of waste tank additives to eliminate whatever untreated waste stink you might be worried about.
7.) The Thetford cassette system is the ONLY toilet system that can easily be negative pressure vented thru the toilet neck itself witch makes it impossible for any "stink" to enter the camper. (see SOG vent).
8.) When the toilet is installed in a wet-bath as in my Arrow-U, the toilet itself can be used as an exhaust fan sucking out all the steam from a hot shower. This exhaust thru the toilet feature works MUCH better than a fantastic fan which can actually pull "stink" out of your black-tank system and into your bathroom while your taking a shower.
Provided its not raining or snowing tomorrow I can post pictures or (maybe a video link) of how to use the cassette with a standard sewer hose (stinky-slinky), and how the "exhaust thru the toilet neck" negative pressure vent system works.
Let me know if your interested.
Sorry for the long post.