You are not putting too much thought in, these are the thoughts that make the job right!
The IPL for the 1772 and 1782 through the end all show lockwashers with standard nuts, therefore they must be tightened down. It is all Grade 5 hardware, so it should be torqued to the spec for Grade 5 which is about 35 ft-lb.
Although they should be torqued, this is a good place for a deformed (or distorted) thread lock nut which won't come loose as the rubber relaxes.
As you would expect, the 2182 shares the same mounts and hardware. Based on your post, I ran out and checked two of mine on a new to me tractor (2182-2) I am getting ready for use. One was looser than the other, but they both took 35 ft-lbs just fine without excessive deformation. Getting kind of late, the other two can get checked tomorrow...
For your new install, I would check them again after they have settled in.
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2135, mowing duty at parent's
1872, 46", 50C decks, Haban dozer blade, 450 snow blower
2182-1, Kwik-Way Loader, 3-pt & rear pto, 442 tiller
2182-2, 54" deck, 451 snow blower
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