If you think through it again (i had the same idea until I thought through it 3 times.)
That setup isn't going to help the passengers get in the back any easier.
#1, The seat won't go forward (Everyone's going to have to climb over your center console.)
#2, even if the seat did go forward, the harnesses are still attached to the post/bar behind.
#3, If you go look at your jeep, with a few peices of wood (2by somthing or other,) and place them where the cross member would be, you will relaise just how little space us Jeepers really have, it's a window about 1.5 feet wide, and 1.5 high on the side windows.
My current plan is to get some caribeaners (that spelling would make my grade 3 teacher shoot somone then pull her hair out.)
Anyway, the carabeiners (see note above) would be ancored at the very back of the jeep, right infront of the tailgate/ammo box.
They would be on some simple brackets. Seeing as how I would only run the harnesses when I were offroading, It would be a matter of grabbing the straps, and threading them through the seats. (tHE BACK seat would have to be down, meaning no passangers in the back.)
But wait, there's more.
I just got an idea, the horozontal bar, what if... it were "Removable."
lol, 1 single horozontal bar, like the picture on the right, It would be stored down below the rear seat, running front to back on the extreme left or right side, better yet, it could be mounted to the roll bar, along the stock cross memeber.
Help me here, this is being thought about as I type.
How would you attach the cross bar to the center, and make it stay good enough to survive a roll over?
I was thinking two small tubes on the verticals, with a large pin/bolt.
but you can't get it in, because the posts won't separate that much.
How about this.
drill one hole in either of the stock verticals, at the hight of the horozontal.
drill them to somthing like 3/4" (The diamater equal to the interior diamater of the horozontal.)
Get a huge ass bolt, with a huge ass head, and cut that sucker down so it's only 3? 4? 5? inches long.
then, drill a 3/8 or so hole through the horozontal, through the bolt, and out the other side.
Then all you do is line up the horozontal, drive that sucker though then pin/bolt it with another bolt running through the other way. toss two nuts on the end of it, tighten them together, and voila, removable cross bar thats probably stronger then the rest of the welds.
Now you say, "It will rattle."
Go down to the local hardware store, buy some weather strip, and put it between every metal/metal surface, like a gasket, but its sticky one side, so it will stay.
If you so desire, you can attach the horozontal removable bar to the top stock horozontal, and fasten it up there with any number of items.
I'm gona go draw a picture.
Jeep Icon, Raised 2", Lowered 2", 4pt Independant Suspention.
(Yes, that is an Oompa Loompa driving it.)