just measured mine: 75x75... the first couple times sleeping on the mattress were painful! We added a 2 or 3" topper from Costco for around $100= problem solved. I believe we bought a king, and I thought we would have to trim it, but it was close enough without trimming it.
Before hassling with a new mattress, I recommend trying a topper first... unless you have specific mattress requirements.
dan
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06 dbl cab tundra
P3 brake controller
equilizer hitch
14 Jayco x213
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