Toy Cruiser axles are 1.31 " diameter, plus 30 splines daba daba daba ..
Danas can come in 35 splines versions and 1.41" diameter .. I thought not sure about the diameter .. but are definately more stronger in some version than Toy ..
In fact .. are some Nissan Patrol axles that come with 31" splines and little mode diameter .. stronger than Cruiser axle .. maybe ..
I'm pretty sure that Toy axles are enought strong for a normal aplication and I'm a Toy believer .coz I never broke an axle ..
I thought ( based in my experience only ) Toy axles handle up to 39" no more .. ( locked of course with cromo set in front ) more than 39" Dana and 14 bolt corporate is your deal