Replacing the queen berth mattress, which one to get?

Tempur-Pedic would be my choice: http://artisansmattress.com/custom-boat-mattress-2/
Have not dealt with them, but have been eye-balling them for awhile.

I would avoid any spring type mattress on a boat, you want more give than resistance.

I would recommend a quality memory foam mattress. Find a good custom mattress manufacturer in your area. The RV people can likely refer you to one. Doesn't need to be a brand name. We purchase ours from Select-a-Bed as we got started with them when we wanted a supersized (10' x 12') mattress for our bedroom and the quality has had us coming back for more.

Good luck. And before you make your purchase, lay down on it with the same foundation you'll have on board

We recently shopped on a new mattress, but haven't pulled that trigger yet.... .

One of (maybe all of) the brands they carried could be ordered with a hinge for easier access to storage underneath. I think "Handcraft System 5" was the one we short-listed, and we would go with a hinged version.

-Chris

I bought all new mattresses for myself and crew a few years ago from Ikea.....Queen and full size 4" memory foam toppers.

Agree, that'd be niftier, sometimes... and the bedding/linens would raise nicely with the mattress.

In our situation, it would take a whole bunch of rough carpentry and then some finish joinery, though... outside my skill levels... and at the same time it'd make service access to our under-berth AC (another hatch, nearer the headboard) more difficult...

-Chris

You would still retain all the access hatches in the surface that the mattress sits upon and the ability to lift that entire surface will make servicing any below berth AC units or other equipment even that much more accessible. The smart builders have done this for quite awhile now.

Costa canvas and enclosure is a dealer for a custom mattress company , I don't remember which one . They are in Egg Harbor City , N.J.

I would expect that.. mostly. In our case, the under-berth AC service access hatch is at the pointy end of the right triangle that would form, and too small for me to get in there without disconnecting that end of a hinged mattress support mechanism and moving it all out of place. Hmph!

-Chris

If you want a latex mattress look at Sleep EZ. We have a select sleep 10" medium two layers of dunlop with tallalay top layer, very comfortable. They can help you decide on the firmness and you can also change the top layer later to a different firmness if wanted. Latex is heavy so Pascal's suggestion to hinge and have assist gas shocks would be needed.

Great, they are very helpful and good prices. They are top rated and you can save $$$ buying online vs in store. Also have been in business a long time.

I installed a Sleep Number Bed in my master stateroom (pumped air). It is easily transportable and very comfortable.
I've had it for 3 years without any issues.

Simple setup and easy to change the firmness if needed. We have had ours for several years and would not buy any other type. Have no connection other than a satisfied customer....no hype or false ads....they sell a quality bedding that is becoming increasingly popular....Enjoy!