Conduit and pipe tend to come in 10 ft lengths, which only hang out the back of an 8 ft bed a little, but are a real touch-and-go experience with shorter beds.
If a manufacturer doesn't offer an 8 ft bed, what they're selling probably isn't a work truck.
10 ft pipes I can put through the rear window... would be nice if some short-bed trucks came with bed access like the Chevy Avalanche.
It does, but it's never really made sense for my use. I use the bed frequently, but like 95% of the time I don't need the tailgate down, and for the times I do, I keep some ratchet straps in the back seat.
I used the bed extender a lot, though. Moving furniture, beds, a moped, you name it.
Tonneau covers also slightly help with drag, offering slightly better mileage for fuel