The short bed is definitely a drawback to the Nissan Frontier. With the tailgate on, my 6 foot ladder would not fit in straight, had to put it at an angle. I got a truck cap with rear doors, it replaces the tailgate. It adds about an inch, now the 6-footer will fit straight in with the doors closed.
And I believe this is the longest bed you can get on a Frontier. I see ones with a little 4-foot bed sometimes, they look useless to me.
I see old Toyota pickups with long beds, but the only one I ever saw for sale was $8000 for a 30 year old truck with hundreds of thousands of miles, and this was before the pandemic.