While there isn't a mattress that is specifically designed to support your weight, it stands to reason that in order to make the best purchase, we have to go with a mattress that uses the strongest materials.
Those materials are: Bonnell Coils & Latex.
For the sake of expense, The Bonnell Coil with Latex will be cost effective.
All Latex will cost more.
We carry a one sided Bonnell coiled mattress that is upholstered with latex, but I'd feel better about going with a 2 sided mattress that you can flip, and add latex to it.
I'm assuming that you're considering a king size. If so, I'd suggest going with 2 Twin-XL mattresses....together equaling a king size.
There's a couple of reasons for this.
One, the area of a Twin-XL is smaller and tighter and will hold up better than a one piece king.
Two, your wife's needs are different from yours. Women are curvier and need it to give a little better for them to be comfortable.
If going in this direction, I'd recommend the Two-Sided Wolf Mattresses...The Tulah Firm for you and the Brooklyn Plush for your wife.
You'll add to that, the Ever-Eden 3" Soft Vytex Dunlop topper...in King size to cover both mattresses.
From The Wolf Company we have to offer two-sided, flippable mattressess…at a more reasonable price.
Ever-Eden …100% Pure, All Natural Latex Mattress Toppers…(No Fillers, No Chemicals, No Synthetics)
The best buy, again, from Ever-Eden...a 9" mattress comprised of a 6" Core of Medium Vytrex Dunlop and toppered with a 3" Layer of Soft Vytex Dunlop.
These EverEden Latex Mattresses are made of the highest quality Latex available. There are No Fillers, No Synthetics, No Chemicals…just Pure, 100%, All-Natural Latex.
Rotating the latex mattress and flipping the innerspring mattress on a regular basis will enhance the longevity.
Delivery is free and there's no sales tax. You can order these on line.
Factory Direct to You....All Items Made Factory Fresh to Fill Your Order
Free Delivery Nationwide....US & Canada...NO SALES TAX.