The last few years that I took a bike to the TT we went on our Enduro bikes.  The first year we got dropped off at Liverpool and over we went with backpacks etc.  Needed to sort out lifts / pick ups etc etc (in the days before mobile phones) was a major pain. We were B&B couldn't have done it camping. The next year we realised that Car + Trailer (for 3 bikes) was cheaper than the 3 bikes.  We loaded up 2 off road bikes from home and then put my stepfathers Trident on the trailer in the car park at Liverpool.  Makes no sense to me why it would be cheaper but it was a lot less aggro.