Navigation/Snooper/PC

  I have a CC Snooper unit, but what I'd like is an online navigation site where I could preview a route. I know there's google and bing maps, but they don't have a 'caravan towing' option that I can see. The Snooper has, so far, never given me a problem, but I would like to see a route on my pc before deciding to book.

  I was about to book a CL in Derbyshire, when I looked into the route, in order to follow the site's reccomendations, it meant an extra 45 minute detour and the last three miles on single track roads, so I looked elsewhere