I mow 600 pass miles of highway ditches: there is no way I am scouting that. (LOL)
Even then, I will make my first pass, see something in what will be the 2nd pass and think, "Wow, that is a big rock there, I will have to remember where that is", but I never do. Except for the biggest stuff, forget about remembering rocks, debris and trash from year to year.
As for hitting things, I have a notepad where I write down the strange stuff I have hit. Right now it is a toss up:
1. A brand new chainsaw that slid out of a guys truck and landed in the weeds.
2. A boat anchor...on top of a big hill, well away from the ocean
3. 250 feet of phone line, ripping it right out of the woman's house who was talking on the phone at the time.
There are others though: sheep fence, barb wire...sheep fence and barb wire. Property line pins, telephone pole cables, shoes, purses, tires...tons and tons of tires... I even hit an oxygen bottle hidden in the grass. That was kind of exciting. But hitting a kids bike was kind of sad.
So far, no drunks passed out in the ditch, or dead bodies, but even then, I would not be surprised if I hit them someday!.
I am not sure why we have dumps: apparently we have the American Highway System!