I don't recall but that is what I'd like to do. What would be nice is if they could open to vent. I've had reflectix in the rears since 2006, have boxes in front of them anyway and see no reason for glass but venting might be worth looking into. I was just gonna add black tint but never got round to it.
2006 Ford 6.0PSD EB-50/E-PH SMB 4X4 Rock Crawler Trailer