With the jack and roller method, you need only to jack the structure up a few inches rather than the four or five feet to get it onto a trailer. Then one person can almost always give the structure a little shove onto the rollers, the rollers doing all the work.
At the very real risk of being sexist, okay, I'm being sexist, I can easily picture one woman (as in my case) or even two women, using the jack and roller method, getting the coop moved the few feet to the new location in less than an hour, while in another chicken yard, four men (and beer) will jack around, argue, crack open more beer, jackknife the trailer, move upteen cement blocks getting the structure elevated, over an hour has passed and they've only got the structure up on blocks and at the height of the trailer bed.
Then they get the come-along out and hook one end onto the structure. Someplace. Maybe. Then they crack more beers and argue about how to work the come-along, and another hour passes and still no further progress getting the shed onto the trailer.
That's all. I got tired of watching and left the guys to crack more beers and argue some more.
Sorry guys. I've watched way too many of you work. Yeah, I'm sexist. Shoot me.