How to Set Up Weight Based Shipping in OpenCart - Antropy - OpenCart Developers
4. OpenCart Plugin - Merchant Configuration – eCommerce.Help
How to Hide Other Shipping Methods if Free Shipping is Available
OpenCart vs WordPress for eCommerce - Dokan
Length Classes and Weight Classes management - Opencart user manual
Opencart Free Shipping Manager module - User Manual
Setting up Weight Based Shipping
OpenCart vs WordPress for eCommerce - Dokan
How to Simplify Shipping in OpenCart with Advanced Shipping Pro - Blogs
Setting up the Fedex Shipping Extension in OpenCart 1.5