On my JK, I could shift into 4H at 55mph and have no issues. On the JL, you have to drop under 45mph. It’s harder shifting into 4H on the JL, so I normally drop to under 30mph. I understand you might be on an interstate and dropping speed might be dangerous, but the JL should be under 45. Also as mentioned, 4wd only helps with accelerating off the line, after that you’re just like any other vehicle. Jeep’s usually have more aggressive tires, so it may help a bit more, but you’re still braking and potentially skidding like everyone else.