My Freightshaker has a Super 10 in it mated to a 380 HP ISM, with 4.11 gears.
I'd be thinking it would be a lovely choice (both the Super 10 and/or the Cummins) for a bus conversion. The splitter on each gear makes skipping a gear a breeze, just move the stick. And no range change for the driver to worry about, Just follow the 5 speed H pattern.
A real winner when slowing for a corner.
Works just like the top of a 13 speed, or like a 18 speed: move the stick every second gear, flick the splitter on the other one, only the change in ratios are bigger steps on the Super 10.
The Top 2 transmissions with the automated 9th and 10th gears were a pain on maintenance as they aged. Perhaps, as they were the leading edge of "smart" transmissions, they suffered due to the learning curve of the techs? Anyway, be careful in your choice of used if you go that route.
happy coaching!
buswarrior