The vast majority of trucks that I see nowadays have a bed that is approx 6 foot long or shorter.
I've made it 36 years in construction with a short box truck just long enough for a 6 foot ladder. I see trucks with the 5 1/2 foot bed or even those Jeep Gladiator trucks with whatever they have and I smirk....If the bed can't even accommodate a 6 foot ladder, I don't want it.
4 door trucks don't interest me anyway.
You know how many 6' ladders I have seen on the roadways in the last 40 years? If you had an 8' bed then it generally will stay in the bed. Driving only 100,000 miles a year in a pickup truck the number one thing I see on the side of the road are gas cans, followed by empty coolers, then mattresses! I even ran over a mattress and the springs wrapped around my driveshaft and beat the crap out of the bottom of my truck...