Ours is removed and reinstalled just like a residential toilet. There are two studs (bolts) that come from the floor flange up through the toilet base. Remove the two nuts, turn off the water supply and disconnect and the toilet is free.
The studs could be hidden by decorative covers so they might not be too obvious or easy to find.
Be sure to replace the rubber gasket with a new one when you reinstall the toilet to insure a good seal.
Denny, Connie & Shadow (former barn cat made good)
2000 Itasca Horizon, Cat 3126B, Freightliner Chassis