Only been the once (2014) and got a lift from a friend it their camper. There's a huge field set aside for motorhomes at the village end of the Arenberg Trench, we arrived on the Thursday evening and there was plenty of space, might have still found a spot on Friday, but no chance by Saturday. Plenty going on, cycling and other entertainment, easy walk to the trench, though for the main event you need to get there a couple of hours early for a good spot.