4. This is the "downstairs" layout, showing the cockpit (driver's area), the bays, and the engine room. Note that Odyssey is tall enough that there is room between the upstairs deck and the wheel wells. Batteries go over the steer axle, and general storage over the rear. Just behind the steer axle is the motorcycle storage, with drop-down ramps on either side. A "tunnel" between the steer wheels connects the cockpit to this bay. Next in line is the "wet" bay with fresh, gray, black, and "drinking" water tanks, the water heater, and the auxilliary electric air compressor, as well as some water pumps and the automatic transfer switch (not shown on the drawing). Behind that is the 350 gallon diesel fuel tank followed by the axles and power train. The 17KW generator is shoehorned in next to the main engine on the curb side, along with the Webasto heater (not shown).