I used to do agency driving whilst in the forces and then after a gap of some 20 years I went back to it..... I am now basically retired and I drive through an agency 1-2 days a week.
It was with some trepidation that I went back..... I only have a class 2 so no artic work for me, but I had no hassle with the size of the wagon.
What I did notice was :-
so much more electronics in the vehicles. ( I passed my test in a military vehicle with a crash gearbox - if you do not know what that is, ask your dad). now most are auto with little buttons or switches instead of gearsticks.
all of the machine including inside the cab on camera
the attitude at firms was far better than it used to be towards the drivers (no more thought of, as the thief that had not been caught yet
very few 'agency's' for ad hoc hours , most are 'placement' agency or recruitment firms now only looking for full time staff