IPsec site-to-site load balancing ?

Dear all,

I would like to know if there is a possibility to do some load balancing between site to site IPsec tunnels ?

Here is my scenario :

I would like to install an ER8-Pro in a remote office and use IPsec site-to-site tunnel to connect it to the main office.

The remote office has two internet connections with two static IP's so the idea is to create two IPsec tunnels to the main office and use some kind of load balancing for redundancy and to maximize the bandwidth as well.

Can anyone helps me to achieve this ?

Thanks for your help.

Anthony