If your doing multi level apts then a TM would not be practical. The Legend is an excellent machine.
Sorry, I was talking about a 30amp line converter. You plug into the dryer receptacle and it has 2-15 amp plugs attached. If you are still worried about tripped breakers then you could also use the washing machine plug. I would think that a trailer would not be too convenient.
The best portable setup in my opinion is the Mytee Airhog with the Waterhog. Great modular setup. You can get the hot turbo heater for heat. This stuff along with a scrubber and decent wand or rotary extractor and good chemicals.......Awesome system.