WHBM
Think kinetic energy (square of the speed etc).
Double the crosswind speed, you end up multiplying by 4 the potential side load on the gear. An increase from 20kt to 36 kt is very considerable. I've landed a C206 in 30g35 straight across, but that was made easy by having over a mile of runway, therefore higher landing speed, flapless. Most heavy pilots don't usually have that luxury.