Just pulled our sofa & put in 2 rocking chairs. Old age they say? 78 & up.
Yours might be different.
What I did was open the hida bed all the way up.
Lifted anything that would open up.
Ours has a steel frame between the 2 arms that holds the weights of other parts.
The frame is 1/2 way up the arms held by 4 screws into each arm @ that point.
The "kick board" in the front screws to the arms @ the front (2 screws)
To hold everything, there is a board (1x4) @ the back of the arms about 3" off the floor.
This was the key: it had 4 screws into the wall to be removed.
That allowes the arms etc to be pulled out (they just sit on the floor).
1 or 2 screws go thru that board into the arms.
The platforms piviot on pins in the steel frame going into the other moveable platforms & are held by clevis clips.
Yours may be different in some ways but I searched & searched for floor hold downs or "L" bracket mounts only to discover the above.
Be very careful of your fingers there are many pinch points.
By the time I had it all out I realized I should have made a video.
2020 Cougar 24sabwe, 2004 chevy 2500 HD