Hey! Authors here. Thanks for pointing this out, Walters comment addressed it very well. 8020 has become sort of the "kleenex" of extruded aluminum in the van world, especially. We added a quick blurb to clarify this on our guide this morning as I am sure others are confused as well. I will also say have no fear, our guides were created wayyy before 8020 tossed us an affiliate code to integrate, so it's not an ad. Hope that helps and thank you for reading!