0Burf 8 years ago ReplyUpvoteI would suggest you build platform steps. Basically, two wooden boxes fastened together to form a pair of risers and landings. Use 5/8-3/4 inch thick exterior grade plywood for the landings and dimensional lumber of the appropriate size for the frame and secure with glue and stainless steel or galvanized screws. Its quite simple to construct and very strong. Here's a picture of what I am talking about.