Softside Waterbed waveless tethered Questions

Is there anyone here who can help us find the equivalent to our old original softside waveless waterbed? Or point us in the right direction, which is NOT a waterbed dealer-we have already been down that road.
For almost 25 years, without incident, with more than 20 moves, we slept on a Land & Sky Softside Waveless tethered lumbar super reinforced something or other. It had more than just corner tethers, & it had a system where when 1 person got in/out the water displacement equalized unlike the 2 different replacement bladders we tried, which would just create a hump on the other side. My husband did not bottom out on the original ever. It was 8 or 9" bladder.

We were told years back that Land & Sky closed & that they had a patented system that no one else uses.
We stopped looking after 2 replacement bladders that sucked.
My nightmare began when I had to replace that bed.
Never had the heat issues with a softside waterbed ever.

The issue we had when trying to replace was that dealer after dealer kept telling us their mattress was the same, that the tethers & components were unnecessary & that the foam sheets do a better job. This is NOT correct, nor true, the tethering system that Land & Sky (which was Somma previous) has a superior system. Surely someone purchased those patents & is doing something with them?
Help Please.

We’re going back to water-after a love/hate relationship & trying to make latex work.
We do love the feel of latex, but can’t take the heat. To get the relief we need, thicker layers are necessary, & it is thermodynamically a full heatsink that is a hot mess 4 hours into the night. I don’t want to argue that point. I’m tired of trying to make or find a hybrid.
Hubby & I had a long discussion of all of the things we have been forced to add over the years since we replaced that softside-we never needed multiple fans, nor an extra AC unit just for the bedroom. In the summer we unplugged the softside heater & the water absorbed the heat, we actually used blankets. There was no waking up sweating ever.
We used less AC in the summer, & turned the heat down in the winter, and it was DURABLE-we had shephers/danes/mastiffs & cats-never was a problem.
Thanks!

Have you checked with this website. I dont have much information on waterbeds, but dug this up.
https://www.thewaterbeddoctor.com/las/landandsky_softside.aspx

Yep-I’ve been all over that site. Again. Maybe 5+ or so years ago I tried to purchase one of their Land & Sky replacement bladders online & it was cancelled. I called & spoke with someone & they told me that while it is still listed on their website, it is not in stock & that they are no longer made.
Lately looking at it, I see SEVERAL Land & Sky (listed as NC for New Century) in both hardside and softside. It just doesn’t make sense that there are now MORE unavailable replacement bladders added to their site. I am going to call them again, & this time attempt to get an answer. Maybe speak with a manager.
The Land & Sky was superior in the way the water displaced-they had a system that didn’t hump. Waveless was waveless. My bed literally felt like a very firm supportive goosedown mattress.
Problem is the sales people of beds want to tell you the other ones are the same or better-they are NOT.
I dissected my Land & Sky before putting it in the trash. They had all kinds of crazy stuff inside-not just foam layers-there were even things attached to the bottom and believe it or not, some metal pieces that after 25 years were not rusted! many many tethers & other weird looking things. This stuff is what guided the water when pressure/weight was on top & prevented that hump & roll type of thing. I dissected 2 others-they were just foam like fiber layers-like outdoor batting. One had no tethers, 1 had 4, neither of these felt even close to land & Sky.
I need to speak with some dorky old fart that knows Land & Sky construction & find out what the closest equivalent might be.

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