The tractor with the huge bucket is a 1954 John Deere 70
That bucket is crazy huge it was few inches shy of fitting my 2520 into it nose to tail. Its a snow bucket i think its 96 inches and super deep i can fit so much stuff in there. funny thing is i can fill it with dirt and the 70 can still lift it and drive around the rear end on that tractor is so heavy. I've moved a lot of dirt with it though of course it doesnt dig very well haha.
Congrats on the 3530! i also did the same thing went in and was trained on how the auto connect and everything else worked. there are a lot of differences and upgrades going from a 2X20 to a 3x20.