Hi @CSNWSAFE, try out some article suggestions below:
Maybe they can help you to find what you need!
Shopify can ship orders with a weight less than 150lbs, if the order weight exceeds 150lbs such packages can be shipped through a freight shipping method.
I would suggest the multi-carrier shipping label app, the app’s freight shipping method automates the shipping process based on weight limits.
The app also supports domestic, and International shipping services of all the carriers like FedEx, UPS, DHL, TNT, and many more.