In site A, you definitely need to use the public ip address that the router is natting the Site B ASA to. If you don't have one you could use the public ip of the router and forward to the outside of ASA.
crypto map OUTSIDE 20 set peer
tunnel-group type ipsec-l2l
Option 2 would be to create a dynamic tunnel where no peer address is specified in Site A ASA. In this case you would do this...
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...