Usually people trailer to events when they have a dedicated track car that is no longer street legal. A second reason would be to trailer a car that you convert things such as brake pads, tires, etc prior to the track day and don't want to drive on the street. I suppose a final reason for a trailer is to not get stranded at an event if you have an issue with the track car. Blow a motor, hit a wall, whatever and you just roll it into the trailer and drive the rig home.
I'll again mention my observational testament: people who trailer their cars to HPDE events are inevitably the ones who either crash or have a non-driveable mechanical issue. Seen it at almost every event I've been to!
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2013 Cadillac V-Wagon, RIP Z
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