Hi, I've tried to sleep in the FJ a couple of times already and I was satisfied. Until now I've used an inflatable air mattress bu yesterday I decided to go a step further and I put a full king-size latex mattress in the FJ:
By the way - it is memory foam, not latex.
I was helping a friend to... buy a mattress.
We thought it would come compressed in a box, when we saw it we did not believe it could fit in the FJ :)