I dont think its the material thats the problem - its the edges, which obviously cant be avoided short of having a one piece floor and a *much* bigger van (read : lorry) to carry it around in, or a roll up / hinged floor that folds flat which may then cause issues with gaps in the floor and uneven layers.

Maybe if all the edges were nailed and then gaffer taped down even bots like Mute may have problems getting under it. Then again, maybe they wouldnt

-- Kev