I use a tube just like a regular knobbie. They have tube & tubless trials tires, no difference except for the lip at the rim. The tubless tend to become unseated easier that then tube models at lower pressures. It varies by brand but some people report tubless Dunlap become unseated in the 8psi range, mine was ok down to 5 psi.
Not a big deal if the bead unseats, depending on how it is ridden of course.
When I do get my next back tire, it will be the Pirelli MT43. I think most everybody still runs a tube too, don't they?