Mattress topper suggestions

Yup, throw out the cheap junk RV mattress and buy a decent replacement. A good quality foam mattress should not cost a lot and should last for decades. I don't understand why RV manufacturers think RVers are short. I would see if you can fit in a full sized Queen instead of a "short" Queen mattress. In fact that was one of the major criteria we had when shopping for an RV.