ipsec redundancy question

Hi,

I have the following network:

MT GW ===wifi===MT–eth–MT===wifi===MT–eth–MT—wifi—MT–eth–PC’s

The core network (in bold) has two links per hop (one for tx and the other for rx) and runs ospf to provide redundance (with unequal cost per link) to both tx-rx links. The links which are not in bold don’t run ospf and I want to connect PC’s to to the MT GW with IPsec… First I don’t know if dynamic routing will affect to vpn’s and an implementation of IPIP encapsulation + IPsec transport mode is necessary… and second i don’t know how to implement redundancy over the two wireless interfaces that MT GW have… how should this be implemented? Thanks,