One of the reasons I recently bought a trailer. Yak...When on tour..The group is always in a huge hurry to get to breakfast..They break up camp like some kind of marathon..They like time the event and expect to be out in 20 minutes..(It takes me 5 minutes just to fold up my tent..)
Gosh, when I get older and retired, most of touring friends are) I will be in no hurry like that..Why older folks in such a hurry- Been hurrying all our lives.!)Sorry for the unsolicited editorial.
But, anyway the point..In such a hurry, I have more than once not had all the straps secured and clicked in about the panniers.
This can be lethal....I was lucky. The straps did not get caught up in my spokes....I actually went a mile or two, in the traffic; not hearing the clinging of the straps into the spokes..
With trailers you can pack up faster. And don't have to worry about dangly stuff getting caught up in your spokes.
Think these were the biggest single factors in going Yak..