We stop every two hours, (change drivers, stretch our legs, measure the temperature of hubs and tires, plus check all of the straps. We also go with the chains on the bow eye to the trailer frame. Lateral bunks is another safety item--or in the cats, center bunks .
The UV light will often weaken stitching, so inspect it regularly, and keep a good sailmaker's needle, palm and dacron thread so you can hand sew the strap is the stitching appears to be comming loose.