Total Rider doesn’t currently offer 3-Wheel classes at this time. You may want to check out the Can-Am site for more info and where classes may be offered.
Note, if you are trained on a 3WMC your license will be restricted to only a 3WMC. A 2-wheel “M” endorsement covers all 2 and 3-wheeled motorcycles. Students are required to use three-wheeled vehicles during the riding portion of the class.