Tie down options for step side truck - need advice

I had an 8' cabover on a stepside pickup and I bolted it to the bed.Another inexpensive option is heavy duty straps to the frame or steak pockets.I have had several like the Cowboy,some with floors and others that sat on the bed rails..I always bolted them down either to the bed rails or PU bed.

It's not all that heavy so a solution should be fairly easy..Bed mats help keeping them from sliding also.