have the seller make a sale document,
the transport company should make a cmr document to keep with paperwork he needs to make the trip.
the responsabele person with loading/securing is the driver. you are legaly responsabele for the transported goods, like drugs, guns etc. fist to go to prison is the driver though.
if it's a heavy vehicle, tell the driver to get chain straps as not every driver carries them.
for the rest, this is that one europe thing with open borders