azza-333, seriously consider contacting Extrawheel and asking if they will make you a rear wheel version. Tell them the trip you are planning. They might be happy to do this for the exposure. I fully agree about the rear wheel being more problem likely than the front. A Phil Wood, strong rim, high quality build and big tired front will survive a lot. A highly dished rear with a freewheel mechanism less so. (And it might even be possible to swap axles so the trailer rear could be used as a front and vice versa. You might try Phil Wood on that one.)

If you go this route, post back here.

Ben