I rented an extended cab cube van. 6 ft tall inside or lying down between the wheel wells. Tie down straps and some blankets. No seats to worry about.
That was one of the biggest problems I had, there’s not a lot to rent for a one way trip, that wouldn’t charge an arm and a leg. Big truck rentals would have cost anywhere from 800 to 1200 to rent plus charge by the mile, I found the van for only 140 for 2 1/2 days, so I had to make it work lol