Since you ask....I could be forgiven for thinking:-
Firstly:-
For the owner/driver of a motorhome, manufactured as <3500kg, <7m in length, easily manoeuvrable at only 2.2m wide, fitted with large, extended, multi-faceted wing mirrors, and fitted with a rear-view camera/large display; the AM stickers have no benefit.
Such motorhomes have been included in legislation to cover large HGV’s/coaches and are no more effective on my vehicle plated as 3880kg, than the same vehicle which is plated as 3500kg. It is exactly the same physical size.
Secondly:-
The AM stickers, aimed largely at cyclists, will not protect a cyclist or pedestrian/wheelchair user from the manoeuvres (whether sudden or planned) of an HGV, if the person foolishly choses to position him/herself in close proximity to such a considerable and obvious bulk, deliberately forsaking safety for some other ambition.
Thirdly:-
Having made the flawed decision to ride in such close proximity to such an obvious bulk, why on earth would anybody consider that the same rider would bother to read an AM sticker and think, “goodness, I must keep my distance”. Even considering the glaring colour scheme, the flawed decision-making process of the rider would not be over-ridden by an AM sticker. Rider education is surely required prior to being exposed to live road conditions, not split-second sign reading.
Fourthly:-
The AM stickers are unsightly, damaging to paintwork and relatively small vehicles used for coachbuilt motorhomes do not provide suitable flat mounting areas.
They also don’t suit my paint scheme and graphics...😉