I'd like to second the opinion that the stability control works well. It works unbelieveably well. If a Sprinter does everything else you need a van to do, I wouldn't worry too much about the possibility of rolling over. They really are not top heavy unless you load it that way. Any situation that causes one to tip over is probably going to get any other van, especially if you load properly and drive sanely and defensively. Do as I say and not as I did!
Recently, I was returning from Dallas to Seattle in our 2012 Freightliner 144. I was carrying all my daughter's belongings home from grad school. All her stuff was in the way back of my partially converted travel van. I'm guessing it was close to the rated GVWR and definitely tail heavy.
It was very windy (why is the wind always in your face in Texas?) as I drove across the panhandle towards Raton, NM. Late in the afternoon, the road climbed a small pass and went through a cut in the top of the hill.
Going about 75 mph, I emerged from the cut in the hill and got absolutely slammed by the wind directly on the port beam. My wild guess is 40 mph or higher. Instantly the van moved about 2 feet to the right and as I corrected the steering the stability control system kicked in and it was amazing. It went from feeling totally out of control to locked onto rails in a split second. I've never experienced anything quite like that.
Other than an overdose of adrenaline, it was one of the coolest automotive experiences I've ever had. My old VW camper would have been in Oklahama and my old Econoline would likely have been all the way to the far edge of the shoulder, if not in the weeds.
Incidentally, I got to attend the Sprinter Tour in Seattle last year. I've been up on two wheels in the van with the outriggers and this wind blast was WAY more exciting.
Now if I can just learn from my experience and slow down a little more when the wind blows, I'll be even safer!