Hi,
We installed a California King from the company "Leesa" and have done well with it.
However, the Cal King is 2" longer than the Ideal Rest mattress.
My Adventurer is a 2017 so I'd guess yours is probably set up like mine.
If you put the bed down in flat position and then look below the headboard where the mattress meets the wall you will see a 3-4" thick bolster running across the width of the bed. On my Adventurer, this was screwed directly to the wall with a simple wood screw on each end.
I unscrewed that bolster and... voila! 4" of extra room and you only need two inches for the Call King. The Cal King is the perfect width.
Now we did have some very minor interference from the padding on the lower part of the headboard. It only occurs when the bed is at it's lowest position and you begin to raise it. I usually just put a hand on the top of the mattress to be sure that it didn't get hung up there.
After the first 3 or 4 times doing that I found that the entire headboard could be removed by removing two very small screws hiding in the the fabric pleats on each side. So, we removed the headboard and have lived without it ever since.
We have discussed making a new headboard from scratch that looks better and isn't as thick - but have never gotten around to it.
With that 4" bolster removed the Cal King fits without problem though there is now a 2" gap between the mattress and the wall. When we're traveling we don't do anything about that. But when parked somewhere for a few weeks we'll roll up an extra blanket to put back there to keep the pillows from wanting to find that slot.
That 4" bolster is nothing but a piece of luan with 4" of foam rubber glued to it and a piece of fabric stretched over the foam and stapled to the back of the luan. Like the headboard, we've discussed cutting the foam to 1/2 it's thickness and reinstalling that, too. But, it's too low on the priority list.
All in all - after 3-years - we've been very happy we made the change.
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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