Ok I got that rail from CVT and installed my annex and it packs up wo the floor just fine. I rolled up the door and pulled the ladder out the front of the annex and just folded it up like normal. Then I just kind of bundled it up around the ladder and the cover went on fine. Not much more time involved with packing than normal. I'm going to try it with the floor attached but it was getting dark and I left it packed without. If its hard to pack with the floor I think I will leave it off. I'm really happy even if all I have to do now is zip the floor in. I love the annex but I was kinda bummed at what a pia it was to put on. Thx guys!!