Yeah your bed or rather the hatch in the back do block "some of the road" directly behind your pickup, but i dont really see that as a problem as i wrote.
True its been a while since i drove my pickup, and it had a hardtop over the bed, and it was just a "little" euro pickup ( Mitsubishi L200 2.5 TD. EXT cab )
I am just guessing here as i sold my L200 in 2006 when i got the Suzuki Gran viatra, but this was way before i got into dashcams, and truth be told what whent on behind my car back then dident really bother me as i was stoned most of the time.
I am allso just guesstimating that a car have to be xx yards behind a pickup with a setup like yours to be able to see its licenceplate over the back of the bed, and i am guessing this is too far back back to give a good reading of a licenceplate.
But as i said i would have same setup you have if i had a full sized or even a little euro pickup with a open bed, no doubt about that.
Only if i had a hardtop over the bed like on my old L200 i would offcourse run a camera all the way to the back, and that i would proberly regret as that car was good at getting dirty in the back and i have never beed good at washing my cars often.
And as i so often have said in other threads i personally think that is most cases a single front camera would be enuff to prove that i was not the one doing anything wrong.
As you know i have 3 cameras in my car and i would like a 4 camera setup, not so much to be able to proove anything in case of a accident, but most to be able to capture what drivers do in cars around mine, and then expose them on the internet ( maybe illigally here, but i will keep doing it untill a judge tall me to take my footage down )
I agree with you 100% but if i had a pickup today and it wasent a EXT cab and it dident have a hardtop, i would proberly have 3 cameras in the rear window of the cab, the 2 outer ones angled outward, and maybe a narrow FOV lens on the middle camera.
But thats just my remaining addiction ( dashcams ) talking here