Ahhh...a caravan basher - I knew there would be at least one here somewhere
When towing I'm usually only limited for speed (on motorways) by the centre lane hogs...Cornwall to home average speed of just under 60mph in Sunday!
Mind you there was a spectacular caravan accident on the M4. Car on it's roof in centre lane, caravan chassis up against centre armco and caravan body just off the hard shoulder. Oh, and personal possessions scattered at all places in between. Still, at least they appeared to be en route to their holidays, so no-one would have had to pick up their dirty keks from the road...
I've used the N138 with the van and it's a pain, too many roundabouts after Rouen. They affect averages too much and the 16mpg becomes more like 12 or 13 due to having to keep accelarating.
Anyway, next year I'll be with you tree huggers in my tent...actually quite looking forward to it, even though I will be less well equipped and will suffer more in adverse weather conditions.