I'd be careful mate, I'm no expert but I’ve looked at a lot of rusty roofed vans the past few years, including the 2 I've got.
DCDD4895-3E81-4512-9FD8-D9B59D98E1E2.jpeg

There’s another van 5-75,6cyl with no gutters but with a GVW 2155 kg?