Thank you guys. These Alcoas and tires are from the Freightliner COE kit (except the third axle wheel). The third axle is from a Revell Kenworth front. The support arms are from a Revell Peterbilt rear drives. Both Snap-Tite kits. The "air bags" are actually the rear tires of a HO scale trailer.
Does anybody make these axles in 1/25 scale?