How fast do you travel loaded?

I've had a blow out on a rear for a 32 ft Class A with dual rear wheels. In hindsight, it was probably underinflated and overheated from the hot day, but I can't say I checked the other tires. I was lucky and one exit from a known tire shop, so I drove there instead of trying to change the tire on the side of the interstate.

It was very loud and damaged the inner liner, but it was a minimal loss of control.