I made a boarding step for our boat out of inch and a half white PVC several years ago so that the admiral had a way to easily get aboard. It is about 18 inches long and 12 inches deep with 90 degree elbows at each corner. In the center of the deep side are tees with a piece of PVC connecting them. Around each of the three pipes I installed 3M self-adhering non-skid from Home Depot. At each corner I drilled a hole for a 5/16th inch SS eyelet bolt that is secured with a backing washer and self-locking nut. I used 3/8th inch double braid line between each eyelet on both sides with a carabiner that clips onto the toe rail. There is enough line so that the step is mid way between the dock and deck. The two carabiners allow me to unclip from one side and move it to the other depending on side tie. While underway I clip the step onto the outside of the life lines next to a gate where it rides safely out of the way until needed. It is very strong and will hold well over two hundred and fifty pounds (test weight). As you can tell the 3M non-skid tape has worn through in places and needs to be replaced. After all this step is about 15 years old and has several thousand miles of use.