Well, here in Atlanta our 8280SS was ordered with tinted safety glass. Wasn't all that concerned about the safety glass aspect, but I'm quite sure the tint takes a bit of load off of the A/C.
I'd be more concerned with double pane in very cold weather. So, if I lived in Canada and wanted to extend my season, I'd go with them. It so seldom gets below freezing here, it doesn't interfere with our camping much to not have double pane.
Regardless where you live, the first thing you do with a new trailer is plug up all the drafty holes with "great stuff" and you'll find plenty of holes to stuff it in.
I blocked off that cabinet door in the entertainment center with the grill in it, using a black plastic trash bag and duct tape. I also laid a piece of blue ridged foam board over the laundry chute hole as that lets in tons of heat/cold. We keep shoes in there now.
Those three things have made a lot of difference in very warm or cool trips we have been on.
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2008 (or is it 2009?) Rockwood 8280SS - 2007 F-150
Lot's of mostly Kenwood radios