There you go. The purpose for the two BAS servers would be for HA purposes. If one fails, you have the other one available. Ideally you'd want to configure these behind a hardware load balancer (F5, Cisco, etc), although you could use round-robin DNS to accomplish the same thing (add the generic site host as a CNAME on both server records). But to answer, it looks like you're definitely on the right track.
I'm still working with RIM on the SSL certificate situation with placing a generic site certificate on two or more BAS hosts. I've also investigated off-loading the SSL certificate to the load balancer and using the 18180 port for access, but RIM said that is not the purpose of the HTTP port (which made me scratch my head). Nevertheless, I'll end up writing a blog about it sooner or later.
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