Stopping to let the engine cool off serves no benefit to your van (or any other car) if it is set up as it should be. If it is overheating, then sort the cause of the problem
I would suggest that if you are worried about it overheating you need to start doing some basic servicing .change oil check tappets etc
make sure that all your tinware is fitted correctly. I would also fit a temperature guage
yea, ive done regular maintaince an all my tin were is there, i was stuck in traffic last weeknd (m5 on way to vanwest). Not moving and wasunt sure if i would be ok, didunt want to make a silly mistake.