I have ordered a pallet of black rubber mulch twice now. Delivery is free and a FedEx tractor/trailer delivered it both times.
First order came as one pallet, stacked neatly and wrapped in plastic.
Second time, it came as two pallets, half the height as first but still wrapped nice.
It seems to last, color wise better than wood mulch.
Nicer to walk on and very easy to work with. I have yet to encounter any steel that tires are made of.
I will def order again, as I am sure I will need more.