Vertical bed extenders??? not sure what they would be called

What would you recommend I use to raise my bed walls. I have a move coming up and I'd like to pack the truck with more junk and on my old Ranger there were two slots on the bed side that I could put in a 2x2 post with maybe some canvas or something between that would help me fit more stuff into each trip. Our beds have a smooth top... What have you guys done when you needed to move bulky but light stuff?

Something like what's on the F series pic I found
Thanks in advance

 

Maybe just remove the sliding bed cleats and bolt plywood sheets to the rails? You could use t-nuts to be fancy or just go with bolts and nuts and washers. Consider anchoring a sheet to the header rail too -- if you have one -- so you can pile stuff all the way up against the rear window without damaging it; you could tie all three together with plywood scrap gussets.

 

Rent a trailer.

 

This would probably be my solution as well.