Adjustable queen sized bed in our Motor home

A piece of plywood hinged at about the 1/3 point under the mattress might work for you. Elevation could be adjusted with wood blocks. Or if you want to get fancy, a linear actuator...

Here's another possibility:

Elevation wedge pillows

I use the resmed s9 and have no problem. I also use the FX pillow for the mask. Other wise the wedge sounds good. Could also be you might use an auto adjust machine like the S9

Our 2015 Winnebago Sightseer 35 G has a motorized adjustable bed. I think a number of other Winnebago mono's use this.

How about purchasing the new adjustable bed? Then you don’t have to put pillows beneath shoulder and head. They are automatic and you can adjust it according to your ease. I hope that it’ll help you.

Personally I think the mattress's they make now adays are some of the most uncomfortable things made. Go to a mattress store and look at them.........they're 2 feet thick or thicker and most are so firm they're like sleeping on concrete. Thicker doesn't make a mattress better. The best mattress I had in a motor home was in the first Southwind I bought, it was about 6 inches thick and was really comfortable.

Perhaps your settings need to be adjusted?

Kampy1, when was the last time you had your needs evaluated. I know I put it off from year to year, one too many doctor visits. I know it's time for a visit when DW can't sleep and wakes me up and tells me I'm noisey.