13 ga spokes are futile when the metal is made of iron/aluminum/copper/lead scrap. As many spokes from a certain country are now. There are good spokes from that country, my yubabike came with them, but how one sorts the real steel from the scrap metal without a $50000 incoming inspection test is not obvious. Brand names in that country are not a protected commodity. QA inspectors can be bribed, and without proper auditing by corporate officials, frequently are.
I've been buying thinner 14 ga DT swiss spokes for my re-build of wheels to put IGH or hub motors in them. I've been extremely happy with the result. I load this cargo bike with 170 lb me and up to 80 lb of supplies on the back in the panniers. DT swiss spokes are not cheap, were made in USA, have a US registered trademark, and come in a pack of 50. I bought them from thebikeshopstore.com . I bought some extra long nipples (12mm) from the same source which cover up unevenness of my assembly.