We have just spent the past 3 or 4 days driving up from the South of France. I'm with Val and Euro all the way. French aires are plentiful and clean (vans come regularly to empty bins)and caravan signing is clear. It's interesting to note that, in most cases, cars and caravans are pointed to the same area and trucks sent round the other way.
At no time did we have to park with trucks. We used the shops for basic supplies, but also ate in our van.
Back in the UK, we pulled into the services at Reading on the M4. Appalling signage - there is a small amount of space for caravans, as we subsequently found, but it is not signed when you come off the motorway. Not wanting to get ourselves trapped in the car parking area, we opted for the truck bays.
We planned to eat here. Horrified at the prices (