Rear Seat Won't Lay Flat

[Colorado Yeti]

I have a 99' Two-Door Tahoe with a cloth interior. I going mountain climbing tomorrow with my son and was considering taking my Tahoe and sleeping in the back with a queen sized air bed. The problem is that the rear seat doesn't seem to want to lay completely flat. It always remains ~ 15 ~20 degrees canted, even when I compress it. Is this normal? Is there anything I can do to get it to lay flatter? BTW, the Yeti is 6'4", so I'm not sure if I would fit back there anyway. Thanks.

 

[Eman85]

I remember having the same problem on my daughters 2 door. Did you move the front seats forward and remove the headrests?