I have an Uplander distributed by Rush River. It has a wood interior, foam insulation and aluminum exterior. I've had it for 3 years and have had no problems with it. The box is well built and has stood up to everything well.
It is well insulated and very cool in hot weather. I had the sliding ventilation openings put on all 3 sides. I just bought a new truck and put a cap on it. I'm selling my box if your are close to Florida.
I'm not close to Florida or I'd come see it. I'm looking at the diamond plate box. I really appreciate the offer and information. Maybe someone on this forum is close and interested in the aluminum box. Thanks again!