You can cluster QlikView Components.
Qlikview Server and Qlikview webserver on one machine and QlikView publisher on another.
By this you can distribute tasks. Server 2 will be responsible for reloads and schedules where as server 1 will just serve user request.
Generally in a clustered environment Qlikview will share one complete instance of document to respective servers. and if the load on server 1 is more then it will redirect another user in a queue to server 2.
But I don't think it can share resources for the single instance on multiple servers.