The wing lifts everything. Placing weight on the wings is better, as placing it elsewhere means a stronger (heavier) fuselage is needed to support it. A flying wing is a great shape, for cargo, not so for passengers. No window seats.
Something else to consider. The fuel tanks are in the wings. With rear mounted engines, there is a fuel pipe the size of your arm running under your feet back to the engines. Want that to break in a belly landing? (Assuming you don't always fly J and sometimes sit in the high number rows.)