Every Saturday I fill my truck bed with garbage cans and dump them at a transfer station across the highway from where I live. (We have no trash service in this rural area). I used to cram bags of trash into the back of my Honda CRV, which worked, but was often messy and stinky. You can hose out the back of a truck bed.
I used to think trucks were mostly useless, but have found that many people have weekly uses that make a lot of sense.
I do question the logic of lifting your truck so high you can't reach into the bed.