As promised I'm adding pics of the new(ish) window coverings. I also bought my first roll of Reflectix today and installed it on my side, sliding door windows and rear door windows. I opted for indoor/outdoor carpet for the driver's and front passenger's windows for a few reasons.
1) I live in the SF Bay Area where we are blessed with what is commonly referred to as a "Mediterranean Climate". That means it's like Hawaii. We don't have any real seasons here. It's pretty much always warm, sunny and mild.
2) I wanted something that would "breath" like a screen when the window was rolled down, but not let much light out.
3) Those windows are not tinted as darkly as the rest, and nothing screams "There's somebody over here living in their van!!" like foil insulation so bright and easy to spot, you can see it from space.
As for mounting the carpet to the windows, I simply used the "scratchy" side of adhesive-backed Velcro and stuck it to the weatherstripping. The carpet acts nicely as the "soft" side of the Velcro, so there's no need to use both. I did however find it necessary to back up the adhesive with a little Super Glue so it would stick better to the rubber surface.