So my challenge is a cutaway Ford (8 on 6.5 old school) 2003 rolling on Dana 50 front , and Dana 70 rear. I have singled out the dual rears to 19.5 railroad rims (did this before on 2003 F350) . Current van is 2003 Ford 7.3 Quigley. Love the van, shaking it out before further mods. The 19.5 set up cannot be aired down. For general use they are fine, but I would love to be rolling on 20" custom steel rims from say, RedBarn Customs in Michigan, but any customs are $$$. I need 6 rims (carry two spares). I have access to HMMV rims, and was looking at various tires for mostly road use. I would LOVE to be able to air down. I am CHEAP!! 
. Thoughts?
. Thoughts? 