There are a number of reviews of last year's show on this thread here, http://hmvf.co.uk/forumvb/showthread.php?24641-Trucks-and-Troops-2011
Safe to say a number of people were put off after last year's show. As I mention in that thread above it was the first time I had attended and having driven 182 miles we were all done by around lunchtime and were on our way home again at 2.00pm, not something you would expect from a national show.
Might be different this year with the two shows being on a different weekends, but as BRB says above I'd save your petrol money and go to Overlord instead.