a few... though no personal experience...
Less prone to mud packing since it is higher in the back?
More protected... since usually you are going forward less chance of ramming into (or through) something...
Larger coolant capacity... more fluid to fill the lines... does that make it run a little cooler too? (increased surface area)
Further away from engine heat (also helps cooler operating... especially since it will not have highway speed help... just fans)
Just my .02 von...
There has to be some benefit... you see most of the Baja trucks and CORR trucks mounted in the rear... sure some are mid engine, but still....