I know that at least 2 or 3 seven owners have used Uhaul trailers to get their cars to NJMP. They have said that the trailer is pretty heavy and the caterham just fits width wise.
They all had to use ramps or board and some blocks to get the car on an off the trailer. But it can be done and there is always a lot of helpful guys at the event to ensure that your car gets on and off safely.
I had lunch with one of the guys yesterday before you posted, but we did actually discuss this. He said he did rent a truck too to haul it. He drives a Subaru SUV usually. Don't know if that was in play last year as it's a pretty new model. I agree with the above, check it out now to figure out what's needed. Good Luck Tom
Mangia bene, Ridi spesso, Ama molto, Guidare veloce
2000 Caterham Superlight #123
1.8L VHPD Rover K Series
2009 Caterham SV
2.3L Cosworth Duratec