How far can you travel on a broken leaf spring?
In 2011, I first noticed my trailer leaning to one side in Bosque del Apache, New Mexico. (I thought the campsite was just a bit off level.) I drove 850 miles to home with two camps along the way. Only when I got home did I notice a broken spring. (Was I just stupid? Yes, but then I was pretty new to RVing.)
I upgraded all springs from 6000 lbs/axle to 7000 lbs/axle (actual axle weight is just under 5000 lbs) and have had no more spring problems. I don't know what bumps feel like in the trailer, but at least it has shocks.