I have the subject axle available.  Includes a set of 6 lug dually wheels (total of 4) with unusable tires on them and the lugnuts (normal righty tighty on both sides, unlike some axles that had reverse threads on one side).  We are close to the I-90 interstate, and I'm happy to help load it. Includes the full length parking brake cables, which I carefully disconnected and wrapped to the axle housing.  No idea on the history, but there is very little slack when I turn the pinion flange - slightly less than 1/4" total movement at the flange edge, which is very good.  I purchased a bare frame and needed some bits off it, but do not need the rear axle. 

Thanks, Ctgriffi.  I did google it a while back and bought one.  I'm just worried it will not work due to a resistance change and the circuit board won't agree the flame is on, etc.  I cleaned up the furnace, oiled the fan and slapped it back in.  So when I start hooking up electrics and gas in a couple months, I'll find out if the original still works.  It did when I bought the Sunrader and I was surprised.  It only has 32k on the clock, so it may have hardly been used.  The internals looked pristine - literally shiny metal in there instead of expected sooty.  Fingers crossed.  Thank you. 

Very much obliged Greg. You made a lot of people happy including me. Thanks.