Suburban Question - Rear Clamshell Lift Supports

[iamthor]

I have searched this site and several others for info on converting the rear hatch to gas lift supports. I have found many people suggesting it but no info on anyone actually doing it. I am going to order the nessasary parts to try this. I have one qestion that seems to have a obvious answer. What weight rating do I need? I opened the top door and put a scale under it. It showed 26 LBS. So do i need a combined 26 LBS of support? More? Less? Any and all imput welcome. The Lift Supports will be mounting to same spots the slide-lock arms mount.

( SEE PIC HERE: http://photobucket.com/albums/c229/six4gmc/ )

Thanks
Abel