I love my cassette toilet and would not want a standard toilet and black tank. There are just too many places without dump stations nearby. There can be problems even in major national parks. I frequently stay at Mammoth in Yellowstone. No dump station. The next nearest campgrounds are the two in the Lamar Valley and Norris. No dumps. Remote campgrounds, forest service campgrounds and BLM campgrounds rarely have dump stations but there will always be an outhouse. I can dump my cassette in any outhouse or any regular toilet.
There is nothing fun about dumping a cassette toilet or a black tank but there are way, way more places to dump a cassette.
Jack - thanks, that 151" number is helpful! I've got that to play with.
NotEVen - I like your stick concept. Basically did that out in the desert this weekend by jackknifing the truck and then plotting the arc of the longest leg of that triangle you reference at 5 degree intervals. With the extended pin box nothing crossed a line 48" from the pin box until I hit 90 degrees, so that's encouraging.
I'm thinking this is all going to come together and I'll be able to squeeze a drom and the Smart on the deck and have a safety margin for those tight turns over a dip in the road.