I don't have a caravan and I'm not sure about any road works in the area at the moment.
However I can say that it is a major road and plenty of trucks coming off the motorway go that way. I've been taking a kid to a school in Winsford that way for the last few years. You won't have a problem finding the route. Most through traffic will be going the same way.
Avoid it completely in rush hour unless you are happy to queue. Middlewich is a bottleneck, there are country lanes to get around it in a car but not with a caravan.