A custom mattress is usually the only way to go to get something the right size. Depending on the bunkhouse, you also have to watch thickness. Had I kept our 5er, I was buying at least 2 custom bunk mattresses this year, although the memory foam is not bad.
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2016 Georgetown 364TS
2017 Jeep Rubicon Recon toad
Nights Camped 2019 - 17