I have a set of the cheap Performance brand Travel Trac rollers. They work well for my use and would probably suit your needs. And I agree that it is probably a good idea to get some practice on them.
I've also seen some very narrow rollers with a front fork mount that are designed for race warm ups. I think they pack up pretty small. That might work well for your needs. Here's one:
https://www.feedbacksports.com/shop/...table-trainer/. It's pretty pricey though.