I've stayed here quite a few times and would highly recommend it, You're correct the access road is narrow with no passing places if towing but dont let that put you off, I have no problem in or out and use a large Mitsubishi and 20ft twin axle van, What I would recommend is that you either let someone walk down in front and ensure you have a free run in, the same coming out, Driving solo there are a couple of passing places if you meet another car.
------------- Doing as little as possible for as much as possible...
We have stayed here too a few years ago, I got out of the car and walked down when arriving with no problems then did the same when we left. It's not a long road.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets