These plastic steps are actually very sturdy and stable. We have a three stepper on the dock by our forward boarding gate. Mostly for crew use but most people could use it. A lot safer than scraping your butt on a wooden dock down to a swim platform These are our stairs, there are a couple of manufacturers here incl Tracy and Marquipt and are the same in the background of the picture posted earlier. The steps are always level thanks to the bracket against the hull. Takes 15 seconds to connect or disconnect. When we leave our home dock on day trips we usually leave them in the dock. as mentioned we ve had guests well into their 80s and they had no issues with them. As to strength, last week we pulled a 200 lbs washing machine and carried it down the stairs at high tide. Two of us plus the machine... much have been 500/550 lbs. Point of this thread was not to praise or bash specific builders but draw attention to an issue most first time buyers aren’t aware of. Till they have to help their friends on board their new toy.