New R/V mattress

I don't know what fit you need (size, you get it). But I recommend a mattress that either has a bamboo cover or one of its component layers is bamboo charcoal memory foam (there's quite a vast selection that can help you here https://popular.reviews/best-bamboo-mattresses/). It's much better when it comes to dust mite resistance and provides a hypoallergenic surface to sleep on. I turned to bamboo when it comes to my home bed and the bed in my RV for about 3 years now and I'm definitely not going back ever.