Anyone know what the load space area of a P38 is with the back seats fully down? More specifically, can I get a sheet of 8x4 in there?
There's always the roof. If you haven't got roof bars, put a blanket down and then gently tighten some straps through the doors before you close them.
Or you might just fit it resting on top of the headrests. I've managed all sorts of stuff in the past with some slightly odd driving positions.