Agree with lill - we move mum and then take the piglets - mum after four weeks will love to be moved tempted by some food in a bucket into the trailer - then go back for the piglets - rest assured this will be fine - Once mum is in the new home - and you then get a couple of the piglets to her - she cannot count and will be reassured that she has her piglets with her -then just drop the others in - there will be a lot of chattering/grunting but all should be okay within a few minutes - be relaxed I find that is the answer.