Bracing bed when removing....

When removing the bed, does it need to be braced?? I have everything from no, to just run 3 supports at the front middle and rear side to side, then i was told to brace it corner to corner and mid supports.. So.. does it need to be braced when removed to have it stay "true" when not on the truck

as long as it still has the floor in it and is pretty solid i wouldn't think you'd have to brace it.

you dont need to brace it if it is still complete