8020 is incredibly heavy. Even 1/8" thick 1x1 aluminum tubing. For over 5 years, our team has used 1/16" thick, and we've only broken one segment (unguarded, whole section was pushed inward about 3 inches).
If you use 1/16" you can use these
Brunner Connectors. They are light and excellent. Just attach a small aluminum gusset with sheetmetal screws to the tubes and you're done.