For Sure. Gawd, thirty years ago, kids rode in the back of trucks. I put the kennel in the back of the truck sometimes in good weather because kitty screams all the way to the vet, and I end up more upset than kitty if I have to listen. I am sure the kennel was secure.
My dad used to let us ride home on top of the hay he had strapped of his 64 Dodge 3/4 ton 4wd flatbed truck. My brother and sisters and I all absolutely loved it! We always stacked the hay so high we could touch stop lights on the way home. We felt like we were flying.
Sadly this all came to an end after several bales of loosly bailed grass hay fell off the truck after we hit a big dip on a downhill curve that caused the truck to start swaying back and forth. Fortunately, dad was worried about the stableness load that day and wouldn’t let any of us ride on top despite ample begging.
The problem with letting dogs ride in the back of pickups... they sometimes jump out. If you have them tied up and the rope is a little too long... it can make an awful mess. It is very sad and I have seen it happen.