I have a utility bike which is just a touring bike with racks so that I can put panniers on it, and I also have a trailer (cycletote) which I can pull. On each trip I use whatever I think that I am going to need, from a single pannier, up to a full load with panniers and trailer. Allows me to be more efficient that way. The cycletote trailers can be reconfigured between cargo, kid, adult, or animal modes.