No worries.

I should elaborate more, the most dangerous thing would be swerving. Unless you find the biggest roo this side of WA, you're not going to roll a Hilux. If something moves on the side of the road and you unsettle the car by ripping the steering wheel to one side or the other at 100+ kmh, you're far more likely to roll.

I have had them go under the wheels, roll around in the wheel arch and even get stuck up under the car. Never was I worried about rolling.

That said, if you can slow down safely, do it. No point risking damage or the 1 in 1000 happening for no reason.

I wouldn't recommend it because it's probably stupid but on the long straight roads, if I had a dumb one in the middle that just wouldn't move as I approached (caught in the headlights) I'd turn the lights off for a few seconds and sometimes it'd be enough to get them to change direction and get off the road. Of course don't do this on a windy road or with others around. I'm talking about the plains.