Probably a Quigley, They've been doing 4x4 van conversions for a long time.... They were doing conversions as far back as the 70's on Ford e-series vans...
Coincidentally I saw him again. I saw him yesterday and didn’t take pictures. I came home and searched for nv3500 on instagram and posted the one I found. It’s a different guy with a different roof rack and sidesteps but they look pretty similar