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The only use I find for drafting is that it can give me a quick indication of a vehicle's aeromod potential, that is, the mileage I get while drafting is the mileage I would get at that speed after I had dropped my vehicle's Cd down into the 0.1's. I get a very minimal mpg increase when drafting in the aerocivic since my Cd is so low and so is not worth attempting.
In addition to possible rear ending of the drafted truck, you also have to worry about road debris either being straddled by the truck or being kicked up by the truck's tires. I've seen a 2x4 thrown up into the air by a truck's tires running over it and wouldn't want to have that coming through my windshield.
One of the tricks I use when being tailgated is to aim for and then just barely miss a box, board, chair, or other bulky road debris in the hopes that my tailgater would not see it since they are so close that they can't see past me and then not be able to miss it or at least give them a good scare, so they back off. I could see truckers using the same technique to get rid of an obnoxious drafter.
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