Bonding DSL Lines

I want to take about five 6mbps DSL lines and bond them as a tunnel to a data center where I have bandwidth and IP space. So I want to create a ~ 30mbps tunnel to the data center. This is a temp fix tell our GigE circuits get in. Any idea how to do this with Mikrotik? I am thinking Ethernet over IP but how do I make that work?

I think this would only work if you had a Mikrotik router at the providers end!