alright stormeh.
Used to live further along the braes fae you in foxbar. Know borrheid very well.
Anyhow to part answer yer question No done the north coast but my cousin did it in a four berth motorhome last year. Im no a motorhome owner and never have been , im a caravaner , we currently tow a lunar quasar four berth. If the motorhomes are similar to caravans , dont think there is that great a difference between many four and six berths regarding towing and manouvering in my experience , and it was no problem for my cousin in her motorhome.
Just dae yer research , good quality sat nav especially one for caravans/motorhomes can help but ur no 100 % foolproof , pick yer route and where ye want to stay etc.
Been towing vans for 14 years something like that , if you have driven large vehicles then all that experience helps. enjoy pal!