Setup VPN - R200 Routers Between Offices

Does anybody have any detailed instructions for setting up VPN on R200 Routers between various offices throughout the U.S.?

I'm experimenting with the built in VPN functionality (for other purposes). It appears the R200 is only able to be configured as a client. So, you would want one server for all of the R200 routers to connect to. 

The R200 firmware does not appear to have any encryption, though, so I would generally not recommend it for the use case you suggested.