Yeah, I wouldn't recommend it. LR4 suspension is a bit floaty for sure. Hit a dip wrong, and away you go into the gigglies.
Most people who say they go fast and "it felt comfortable" are either lying about how fast they are going, or lying about it feeling comfortable.
I've driven the autobahn, Nurburgring and done some stupid $h!T on hwy 95 heading from vegas to Carson city in a brand new porsche I just bought. I can tell you that having driven all three of the aforementioned north of 150 mph, not once was I "comfortable" and I have had track day training and more track time than most.
Fact is that, on a public hwy, with unknowns like other cars, and the worst, animals (because, let's face it we do it out in the middle of nowhere), nobody is comfortable at these high speeds. The stuff whipping by in my porsche on 95 was crazy. On the autobahn in a Mercedes AMG, the Korean executive in the back seat was terrified, so much so that he refused to do hot laps with us on the Ring that day.
Not a lecture, just keeping it real. In my experience with high speed, it is anything but comfortable.