I picked up a spare tire carrier at the junk yard. It mounts on the van door, which isn't optimal.. but it gets the job done. Cost me $10. I probably invested another $5 or so giving it a fresh coat of paint.
If you want to build your own...Are you any good with(and do you have?)...time, a tape measure, a hack saw, metal drill bits & drill, a source for raw angle iron(boxed is overkill)...a grinder would be nice, but a file&brush would suffice... Nuts & bolts.
No welder required
'97 E350 PSD, Black 12 pass. reg van body with windows