Load balancing over wireless LAN

Hello,

I help run a small WISP. we have one Ubiquity air fiber link leaving our office to our customers, which is all one big /19 subnet. however this link has become overloaded. we have a second identical ubiquity that we would like to install and then balance the traffic between the two.

unfortunately all the load balancing i can find refers to load balancing from your LAN to two WANs. What would be the best method to balance the traffic between the two ubiquity links on my LAN?

Isn’s that a Ubiquiti question ?