Snow!

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?

My earliest memory is watching out of my bedroom window on a very rainy day, and seeing a man on a motorbike with a bag of cement on the rear rack. He'd lost control by the time he came into view and I can still remember how funny he looked weaving all over the road. When he fell off I went and got my Dad, who called an ambulance and grabbed the first aid kit that we kept by the front door and went out to help.