or maybe I forgot 
Sad to hear your's have the mite. I got put onto some videos about thermal treatment to kill varroa; apparently the mites die at around 45 deg/C but the bee hive/brood can tolerate this temperature for short(ish) periods. There are some solar powered designs out there; glass lid and a black metal box side facing the sun to pump heat into the hive. Treatment for 4-6 hours kills 100% of the varroa, apparently. I don't use tape very much, but I fold a piece of metal flyscreen mesh and push it into the entrance. As soon as I attempt this though bees come pouring out (in the dark) so a few always get stuck outside. This time I also made some metal framed flyscreen panels to put on top of the hives, so I could leave the lids off and let them breathe. Also because I had to do the move over 2 nights, I had to remove the mesh entrance blockage for the day in-between. When I came back for the second night, there were thousands of bees on the outsides of 2 of the hives (despite the single digit air temp) and they were feisty to say the least. There was no way I could re-install the blockages on those ones. These two also happened to be the heaviest, double box hives one of them I almost couldn't lift into the trailer. Many bees died and I'm amazed I didn't get a single sting. I ended up getting on the road around 8:30 - 9pm. I drove cautiously and stopped a couple of times, got home at 1:30am. Took me 1.5 - 2 hours to get them unloaded and set up in their new spot so it was 3:30 by the time I got back in the house for a rest. I was completely knackered! They're all good now though, settled into their new spot like nothing ever happened. Super busy today in the nice weather.
And the car once again did not miss a beat, took it all in stride. I'm constantly amazed at how reliable this little bus is!
The trailer was the heaviest it's been, and the ride was smoother and quieter than it's ever been as a result. I took 40l of spare fuel in the end (spent $600 on fuel that week! 
) But got home without needing to use them. I needed them to get back into town afterwards though. It was difficult to calculate fuel economy, with the empty trailer I think it was around 14.5l / 100k (yikes!) but was not much more fully loaded. The little 2.0 n/a was using everything it had to get up the expressway hills fully loaded at WOT and sometimes bogging down to 90km/h. On the flat it was fine though.