Just did the same thing...bought a new mattress for my trailer. Original mattress, replaced by a memory foam mattress. I have a Tempurpedic top of the line mattress at home, wanted memory foam for sure, but Tempurpedic doesn't make RV sizes (short queen). Decided to go with
T H I S - Zinus Ultima Comfort 10 inch memory foam mattress. First trip out last weekend, it felt like getting in to bed at home. Combined with memory foam pillows, also like at home, and I had the best sleep I've had in the trailer since I've owned it.