dklanecky1,
I do not have access to that specific information, however try to approach this problem using common sense: what is the difference in weight between Maxima and Murano? Percentage wise? 20%? Now, the weight does not exert the biggest load on a wheel - it is the dynamic load that does that. Let's say like driving 80 mph around relatively tight bends.........I do not believe that for normal day to day driving the Maxima wheels are not strong enough.......
Just my 2c..............I could be wrong though............