Opinions are ....well, we all know what opinions are like. So, FWIW, my opinion
- In 20+ years of driving the Alcan (admittedly not too recently) I saw some of the most outlandish contraptions one can imagine...some of debatable usefulness
- "...back in the day", the big worries were radiators, fuel tanks, and headlights. Other than the possible exception of headlights, those aren't as worrisome now...and I think headlights are much less susceptible to damage.
- Most protectors cause enough damage to finishes (paint, plastic, etc) so that any benefit of avoiding impact/penetration damage is outweighed.
Opinion only YMMV