I have successfully shipped (Within Uk) a 6ft x 6ft x 12" deep car lifter by attaching a pallet to it with the wrap they use in builders merchants that looks like cling film.
In your case I would borrow a strapping machine which you can strap the items securely to a pallet and then wrap with the film using the last wrap around to cover the address label etc.
You'll probably need to get it weighed as well as many pallet companies charge by weight.
I have used these people before http://www.pallet2ship.co.uk/