Sorry to be pedantic here but Can I point out that mh's are allowed to do 70mph on motorway sInteresting response.
Motorhomes over a certain weight are classed as HGV and are limited to 60 on motorways,and 50 on A roads
You can still be a “carefully” as you put it,driver doing 56mph,just like you can if doing 60.
At 56 mph you would keep up with lorries,thus avoiding the need for them to use the middle lane.
Your last two sentences are possibly amusing to some,offensive to others,but in either case they don’t warrant a response.