This web site has some specs on RK Chains:
https://rkexcelamerica.com/products/rk-chains/
It looks like their newer ZXW chain is stronger than the GXW (and a tiny bit wider, heavier).
Similar chart here:
http://www.transmisiongp.com/Picture...tion_Chart.pdf
I didn't do a similar search for D&D Chains but they probably have similar info, specs, strength.