Is there any chance that while in production you will need to update one of the applications but not the other? Generally when you install an application you need to bounce the host(s) that the applicaiton is dependent upon. This could lead to a disruption for application(s) that do not require updating.
Also, if you get into a situation where you need to scale your apps out, you may be limited because everything is tighly coupled within one host. You essentially need to scale out your whole app when you may just need to scale out the Send, Process or Receive function(s)