Carlisle to Linlithgow, best route towing?

If we were still towing Nellie we'd stick to the M74/M8 the M9 as it avoids some busy towns along the route.

Same as Brue.  It is all on the maps.

I just wondered about using the A74 then the A702 from Abington, through to the A720/M8/M9. I work it out as being about 18 mls shorter.

You'll be towing through Biggar and several other villages, nice route but busy on the outskirts of Edinburgh and possibly a bit slower.

through Biggar on the A702 ..... I've driven it many many times on my way back to Rosyth 😊

It's familiar to us too. 

Thanks for all the suggestions. We will be in no great hurry as we'll be setting off from Ecclefechan and we don't have to get to the site until 13:00 at the earliest.