I've sometimes toured with a trailer since that's a way for me to carry the suitcase I use when taking my Bike Friday folding bike on plane trips as checked baggage. It's been handy on trips where I was returning from a different airport and therefore couldn't leave the suitcase stored. As others have said, it's very easy to go overboard on carrying stuff when one has a trailer available. And the trailer itself weighs a considerable amount. So I prefer to just use a pair of rear panniers and try to keep the weight down to about 50 lbs. - 25 lbs. for the touring bike, 20 lbs. for the packed panniers and rack, plus about 5 lbs. for water and food (more if going through an area without resupply options).