I thought perhaps a dedicated thread on the subject might be in order.
Here is an interesting graphic that I think is pretty much on the mark:
Of course the $1.38 figure needs doubled if you plan on "dead heading" half the time. This puts you right at the prevailing trucking rate of $2.75 to $3.00 per mile. It is a lifestyle choice to live on the road as well. Some like it most don't though.
I hear and agree with the sentiment that it is difficult to get trucks where you want them when you want them, frankly it's one of the biggest headaches I have in managing a migratory operation. I keep my phone full of truckers numbers and start calling a few weeks ahead of our projected move date. I tell each one that I am making lots of calls and the day that they can guaranty me a truck is the day I will promise them a load. It helps to own a few nets as well, it's not unusual to find a willing trucker without the equipment to haul bees (I will loan or sell them a bee suit). Ideally it takes a truck a day for a week though it usually drags into more like a week and a half. That's a schedule that I couldn't begin to meet if I owned a single tractor trailer. Regardless of your situation and how you go about it, I absolutely agree with the sentiment that it's critical to the success of any migratory operation for bees to be moved in a timely fashion, delays can be very, very expensive.