Extang Revolution Questions

[DaBigKahuna]

I'm looking at the Extang Revolution for my '71 Short Fleet. I have a couple of questions that are specific to my truck.

I have a box mounted in the bed. It looks like from the photos I've seen, the revolution sits on top of the bedsides... so does that mean that if the box is below the bedsides, the tonneau will clear it? My box is an inch or two below the sides.

Next question, when the tonneau is rolled up to the cab, does it extend into the bed area? If so, how far? When the box is open, the lid sits behind the front rail by about an inch or so... I'd like to be able to open the box without removing the cover.

I appreciate any feedback or ideas.

Thanks