We are upgrading the bedding in our v-berth. We are planning to live aboard our Columbia for another year to year and a half. Struggling with that balance of making ourselves comfortable vs. putting money into a boat we know we are selling. Comfy bedding would be a selling bonus, but certainly not something that will raise the value. We currently have 2 overused therma-rests on top of the original mattress. All that said, I am down to 2 choices: leave the existing v-berth mattress and top with a 4" mattress topper or pull the existing v-berth mattress and use an 8" memory foam mattress. Anyone have experience here?