Hey, I’m Brian. I bought a Felt Bruhaul long tail bike with a Bosch Performance assist system a while back. Seeking sustainable transportation I built some aluminum pannier boxes to carry around my tools and dogs. The boxes got a lot of attention that I made some more to sell. I've attached some photos of a Tern GSD with 20" locking cargo boxes. Check them out and let me know if you have any questions. Cheers!