We put cleats, small strips of wood across the ramp, to give horses grip on the short ramps. Strips are 3" wide by 1" thick wood, screwed into the ramp, so they are always in place for loading or unloading.
I think there are 3 of them on the ramp, which is a bit steep, but horses have no issues with slipping entering or backing down the ramps. They KNOW their hooves will catch on the cleats, prevent slips or falls. They are all very comfortable getting in or out of the trailer.
Cleats are there to be abused with hooves, shoes grabbing them. If they get chewed up, we just replace them. Cheap cost for such good insurance of footing for the horses.
I never did the coco mats, didn’t want to have to roll them up, give them a storage place while hauling or deal with them on messy days of rain or poopy horses.
Cleats are always in place, ready to use.