Mesh with dynamic aggregate egress possible?

Hello all,

I was wondering is it possible to configure a mesh in a way that each node has its own multi-carrier cellular back haul solution and can utilize the back haul of other mesh nodes if its cellular resources become fully utilized? I want each node to first utilize up to 100% of its own back haul resources before attempting to aggregate more bandwidth from and through the mesh as a whole. Any thoughts on this will be very welcomed.

Thanks in advance
Brian