Sure, U-Haul. It's $19.95/day and $1.39/mile. Last time I rented one the automated "don't have to talk to anyone" app I couldn't figure out, but it took less than 120 seconds to navigate the in person exchange to get the key.

You don't need a pickup truck to go camping (they're actually not terribly useful for that) or yard sale shopping. Like seriously it's https://van.life not truck life.