I don't know if you can maximize to each monitor with TH2G because I use softTH for triplehead. It doesn't make LFS any easier except maybe the street tracks since you can anticipate the tight turns much better (same in Grid). Triplehead does however make gaming much more emmersive.

In Windows you can have many independant monitors that allow maximizing to screen and I even found a screen splitter app (Splitview) that maximizes to left or right of each monitor, allowing six possible partitions of triplehead. Also new nvidia drivers have "rotation settings" for each monitor so you set any monitor to portrait or landscape view easily by right clicking their system tray icon and going into each monitors pull down menu to the rotation settings. I reccomend a vesa mount that allows rotation for at least one of the monitors. I got some deskmounts which freed up desk space and made adjusting the monitors relative positions much easier.