Chevrolet Astro electric bed ,other questions Help or tips

[CHRISARVOR]

Hi just bought this Astro. 7 seater with the electric bed in the back
Has anyone taken out one of these beds??
I can't even get a suitcase in there so I would like to remove it
Any idea what the tyre pressures should be
It has a sat nav with only Japanese maps on it any idea what to do about that. Nice big screen on it so would be nice to get it going

Any help tips or advice