Does each unit have 2 radios (e.g. 2x 5ghz radios)? Trunking and communicating with clients with one radio would give you less than half of the normal bandwidth, which is why lots of wireless meshes trunk on a different frequency (though I'd prefer the option of trunking via Ethernet). Unless wifi chipsets have become very clever in the past few years, it seems like this wouldn't allow max throughout.