My tag.....

[bobofthenorth]

Sojourner's explanation reminded me - we had a rig in the shop to do exactly what his greasy sheet does.  Imagine a rolling frame with two arms extending about 2' out and spaced wide enough to slide in front and behind one set of duals.  Then inside those arms imagine a pair of pallet forks that are close enough together to lift against the front and back of the dual pair.  The whole mechanism is powered by a little 1/2 ton bottle jack.  In use you roll it so it straddles the dual set, unweight the axle assembly, pull the axle and then use the pallet jack rig to take the weight of the dual set.  Then you just roll the whole works out away from the truck.  Worked like a damn but it went to the auction sale. 

[Sammy]

A wheel dolly - that's what Bobofthenorth has described. Works great.

http://www.otctools.com/products/detail.php?id=1126

[Busted Knuckle]

A wheel dolly - that's what Bobofthenorth has described. Works great.

http://www.otctools.com/products/detail.php?id=1126

Yer so right Sammy! Now for those cheap chumps (read broke) like me! A fellow I know not far from here uses a modified pallet jack, works great!  He also has it where he can put a small home made frame structure on the same pallet jack for pulling engine & trans ! Purty clever fellow! Has taught me some other real useful tricks too over the yrs!
FWIW   BK