Always nice to have food and drinks handy for them great places to stop along the way..
And the idea of locking trailer to something and having your everyday bike to use once it's unhitched..
The other advantage of a trailer is having it to go get stuff after your campsite is set up. Put your gear in the tent and use the empty trailer to go get firewood.
Try loading that much firewood on your bike! (picture was taken after some wood was removed)