Newbie question: how to tie down camper on the truck?

So, let me ask a little followup question. Is the main reason for springs in the turnbuckles to handle the flex in the truck bed when it gets a little rough? I got a long set of four turnbuckles with no springs when I bought my TC from the previous owner. He said he never had any issues with the solid attachment but I need to ask you experts about your thoughts.