i have the same version but in the 2020 year. what we did was take some measurements of what we needed went to our home furnishing dealer here in town and ordered a mattress that we liked in those dimensions. Got rid of the mattress that came with it before we even picked up the trailer. The furniture store delivered and set it up in our camper when we came home. One of the best upgrades we did. I also built drawers to put under the bed, this helped for extra storage.
2020 Sunset Trail SS253RB