I received word back from my vet today. It's a go.
My original email:
We've been looking at taking our trailer out for a weekend or two this summer, and wondered if we worked her slowly up to it, if it would be OK for stormi to travel with us. She does fairly well with the thundershirt and the Rescue Remedy on the way to see you guys and that's close to an hour drive. She curls up around my hand and lays quietly in her carrier. This seems the best way to make sure she's getting her herbs and food, and to get away from our partying neighbors for a day or so…
Their response:
Stormi should be okay but make sure to monitor for stress and make sure she continues to be eating and drinking. Please contact us with any other concerns or questions you may have.