I moved from Courtland Virginia the end November 2018 to Gould Oklahoma with 3 hives. I had screened bb and strapped the boxes together, 8 frame medium equipment with no problems. just close the entrance with screen wire. I would make sure they have enough store for the trip. The queen was free to do as she wished. Sounds like the bees will be in the boxes a short time before moving them. If this is the case I would recommend that you put a nail or stick pin next to both end frames so they wont move side to side. My boxes had the frames propolise by the bee before moving. As long as you are not stock in a massive traffic jam the bees should be fine with the exhaust.