Glad you are ok, and for a little venting I might add: WTF is wrong with semi drivers? I feel like they are getting worse and worse about paying attention or sometimes caring. Every time I drive from KC to St. Louis (or back) I feel like one of them tries to run me off the road.
Were the other drivers Ok, too?
That JK performed surprisingly well for a 45 mph impact. Do you know how heavy the semi was?
A few things to consider:
Trucks have a lot of surface area, guess what happens when crosswinds come out to play?
It is incredibly hard to keep trucks in proper alignment, think about it and you can figure out why. Then think about how hard it is to drive a vehicle that has it's alignment off. Hint: Most road conditions are terrible and tear up steering components.
Consider that trucks sometimes have bump steer, whether it be big or small.
Dips and grooves in the road will pull the wheels in whatever direction the dips and grooves are going. Couple that with the alignment being off and sidewinds... guess what happens?
Remember when driving alongside a truck at night, your headlights are literally blinding the driver. Literally. Notice how the side mirror is huge as ****? It's the same as pointing your headlights right in their face. Gtfo of the no zone, also... it's wise not to hang out on the left side of a truck anyway for other reasons.
Brake checking a truck is asking to be killed, some drivers won't even touch the brakes if you brake check them. Trucks don't stop quick anyway, and none of them are going to risk jack knifing when said brake checker caused the accident to begin with. FYI a lot of truckers out there have dash cams, just in case you want to brake check for whatever reason.
If a truck is passing another truck, and you're behind the truck passing in the left lane... do not cut to the right and pass the fast truck on the right, I'm sure you can guess that the right side is a huge blind spot. That's a surefire way to get a ticket as well. Keep in mind that depth perception doesn't exist with most mirrors, especially at night. So we can't always tell when our trailer is clear so we can merge back over. Hence why you see trucks dimming and flashing their lights at each other all the time. It's the "you're clear" signal.
Now factor in all these things in the course of 11 hours, plus other variables... and you can figure out what's going on. It's a truck that could weigh up to 80,000lbs+, not a car. Completely different vehicle that behaves completely different. Hence why you need a Class A license to drive one. I hope your question has been thoroughly answered. Consider these things in the future when driving around trucks. Don't believe me? Go get a CDL and hop in a truck.
To the OP, glad you're ok. Some drivers (truckers) out there have no common sense or just could be rookies... without common sense. If you're falling asleep at the wheel, pull over and power nap it. Otherwise this happens. Just be glad he wasn't going interstate speeds when he hit you. Guaranteed death.