I looked into starting with a CraigsList off-road winch Ford truck bumper, and adapting it to my e350 a few years ago. Definitely not even close to a direct fit.
I found that the trucks are much more rounded at the nose than the vans, so the truck bumpers wrap around the truck body, where the van's nose is flatter, and the van's wheel well opening is closer to the bumper on a van. If I remember right, they also have a different frame widths.In the end, it was going to be a lot of fabricating, and I came across an offroad bumper for a van.
1995 E350 7.3 Diesel, 4x4 high roof camper, UJOR 4" lift