Titan drawers lay flat with the back seats folded down. One side fridge and I sleep on the other side.
Layers are (bottom to top):
closed-cell foam mattress (i used yoga mat),
sleeping pad (honeycomb-style so the air stays where it is),
ARB sleeping bag (not a fan of mummy-style sleeping bag)
extra blanket if needed.
One good thing about this is when I do multi day camp, I don't need to pack up everything. Just roll the yoga mat forward and fold everything in the backseat. Bungee cord it. And still have the space in my trunk for packing things. Pull up to the next camp site, roll out everything, done.
Since it's now in winter, I put a small
heated blanket inside the ARB sleeping bag and plug it to the 12V in the trunk(boot). This 12V is wired to the secondary battery, got a Redarc BCDC to manage it so doesn't drain out overnight. Otherwise can always use a portable power station like a Goal Zero to power it.
Also an old Van Life trick, use Reflextics to insulate the windows.
Got so much good sleep here in Canadian winter.
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