Snow!

c - you'll end up leaning because of the weight and you mustn't lean. At all.

I am meant to be collecting a 12kg bench vice.
Should I:
(a) put it on the rear rack for lower center of mass
(b) just carry it in my bag to use for balance
(c) get it another day
(d) get the bus?

Bonus question - How much should I lean in either case?