I worked around the Allis-Chalmers 562's a lot back in 1963, Burt Altfillish/Fulton had a big spread of Allis-Challmers 562 and I think two 555 pushers, and J A Thompson had a big spread of 562,s I worked for Sully-Miller in Mission Viejo California back in 1963 and they rented from Thompson there Allis-Chalmers 562's with the twin can and they moved a lot of dirt on our Sully-Miller projects. I was also lucky enough to run a Allis-Chalmers 555 back in 1963 0n another project, and it took quit a long time to get used to backing up, you had to turn the sterring wheel to the left to make the 555 turn turn right, it was hard to get your brain to work in the wrong direction for the reverse turning, thank god I never ran into a coming scraper coming in next to you. The 555 had the power and the wait, with all the led in the tires it was a good pusher. I have a photo of the Altfillisch spread pushing one of the first Cat 657 scrapers with a D9G and a Allis-Chalmers 555 pushing together and the photo was taken by Shephard tractor and all you see is the 555 dozer and the front radiator pushing on the rear of the D9G.