Can’t say I generally find it a struggle Rordan, or find access to sites particularly difficult. Given the general preference for rural locations, navigating winding country lanes is an unavoidable neeccesity for those who like to make the most of the freedom that caravanning brings.
The only time I would have had an issue was if I had approached Park Cliffe from the direction of Windermere, instead of Newby Bridge. Now there’s a left turn that would be impossible !
On a similar note, as we used to enjoy family camping at Fisherground (Eskdale), I would still like to take the van there one day. Fisherground can only be accessed by driving along at least a couple of miles of winding single-track roads either way and so it is certainly possible, but just perhaps not worth the risk of meeting an oncoming caravanner !
Regarding the Sat-Nav, my in-built system does have a trailer mode, although I’ve never used it and have never felt inclined to investigate its purpose, and I believe that many of the after-market units feature some sort of “HGV mode” which may be what you’re looking for ?