olywrestle - Thanks for posting your question on the forum!
When load balancing is enabled, this will allow you to have multiple default routes active in the routing table at one time. These routes are of equal cost. As far as how the traffic is split, this is determined by the 'per-packet' or 'per-destination' setting. It is not affected by the bandwidth of each link.
More information regarding load balancing in AOS can be found in this document: Configuring IP Load Sharing in AOS - Quick Configuration Guide
Please do not hesitate to let us know if you have any questions. Thanks.
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