Does it have to all fit in the boot... it's easy to increase capacity with dry bags strapped on top. Is there any space in the passenger footwell?
We cycle with all of that kit and cooking gear: two panniers and a bar bag each, and the tent on top of one rack and the mats on the other. So it might just be possible.
Mats: Do you want full length? And do you want them to also work as chairs? We use Therm-a Rest full length.
Tent: Robert Saunders Base-Packer 2 twin porch... more than forty years old...
Jack, handle, tools and spares can all go in the engine bay.
Jonathan