I haven't been working on cars for too long, about 10 years. But in that 10 years i've been working on them usually 4 days a week, at least. When i was putting my 5.0 Ranger together, it was literally six days a week. Same with my current Jeep project. And every time i end up having the vehicle supported by four jackstands. Whether it has solid axles at each end, unibody, etc, i have never had any problems. I do have several sets of jackstands (2 pair 6-ton, two pair 3-ton, 1 pair 2-ton) that let me use what size is appropriate and fits best. I am also paranoid about safety so i make sure it is very solid when i'm under it. But once i get to that level of safety, i forget about it. I concentrate on the job i need to do and forget about the fact i could be killed by a falling car. Because i know it won't happen under the conditions. The first time i worked in a shop with lifts it took a little getting used to walking under a car. But once i did get accustomed to it, i could do it all day without thinking about it. But only after i made sure the lift was positioned properly.
Just my long-winded opinion. Don W