yesterday I was over the moon having found a promising lead. attached you'll see a bus which is build on a 1963 C30 frame, which the owner asked $1500,- for. 19,5" tubeless, dually and 10 bolt pattern.
I thought I''d buy the whole bus and only use the front and rear axle but I have no idea what the rear is so I measured the width of the dually 80" (incl wheels) and the front is only 73" (inc wheels) that seems a bit narrow for a C60.
So I think i've come to terms with the looks of the refab'd 20's and found 245/60R20 tires with a load index 107, which means 2000lbs per tire.. should be enough. I'll asked my fabricator if he can widen the front wheels inwards and the back wheels outward with both 1 extra J backwheels are now 7,5J and front 7.
unless someone come's up with a brilliant (affordable) idea, the progress can be followed on my build thread. link is in my signature.