No, they don't.
Good choice! If I would've thought about my project a little bit more, I would've done coil springs... I thought I was saving time by going the leaf spring route, but now that it's 2 months later and I'm just now getting the motor in, I could've done coils... lol
That's awesome that you took over dad-duty for the boys, make your son proud and build the hell out of that van!
I'm very sorry to hear about your son Alex. I bet he's smiling about this project though. :safari-rig: