how much room

We are nornally heavy packers, especially on the trip we are currently planning.From toronto to seattle to oregon ,then up to Bella Coola bc for the winter. We travel with a cargo canoe, motor, chain saw generator etcetc.
Plan to buy a 1/2 ton truck as our tv, but plan to pack the TM as full as possible. How much room is there in a TM (2720) once it is nocked down. In our old pull out we had lots of room, however I envision limited space due to the cabinets and washroom foding down. What is the story?
Really would appreciate some insight.
Gary