Well we ordered the Sleep Number mattress bed system, and the struts provided by Newmar work fine holding it up. Our 5th wheel years ago had struts, getting it started on the move up is hard, BH cannot do it, but once is moving up she goes. Having a dowel rod safety holder is a good idea, added to "must do/haves list".
I had one fail on our last coach, mid door under step storage, and played heck trying to find replacement with the exact poundage to keep step up. Never matched it correctly, and I had to hold it up for a bit before it would hold. That means I am going to make note of lb. of the ones on the bed, so I have reference if I have to replace them. As aside, we love the sleep number bed, Cal-king sheets from Marshalls work very well, and were not all that costly to purchase, a little large, but the spacing between bed and cabinets is tight, the extra is working to help make up bed easier.