trunk(4)

[Nick Price]

I was wondering - could trunk(4) be used to aggregate interfaces on 
separate networks?  For example, say I have a pair of internet 
connections and I'd like to set up a failover or roundrobin between the 
two... would trunk(4) be able to handle this or would another method be 
preferable?  If trunk(4) isn't able to handle this, what would?
Thanks
Nick