Floor bolts protruding out of Cali rails

Can anyone tell me how to remove the 2 bolts in the floor as pictured please, I found them after buying the Caravelle second hand. Don’t know why they are there or how to remove them. Appreciate some advice, they seem pretty solid.A324FE79-678E-4D19-80EB-0EE3544BD076.jpeg
 
It’s the only photo I could find but it’ll give you an idea of how the rail looks underneath

8292CC75-2EE1-445A-AF03-CC6FDE78D889.jpeg
 
Probably part of a fridge tie down kit or similar. Can't remember if there are fasteners under the rear tie down to remove it or if you need to slide the whole bench forwards and off the rails as said above (it's heavy!).
 
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