Current solution King by night Table by day
Thanks all for the suggestions and assistance. Here's what is working for us so far.
We removed the pedestal hardware from one of the "dinky" tables and attached it to the large board. When attached to the rear pedestal, it is comfy leg room and table size for day use. After taking the picture, we also discovered that bed pillows behind the Indy cushions provide enough back support for comfortable sitting.
We also purchased a 2"memory foam king pad, used king bedding on it, and in the AM can quickly roll it into a bolster type pillow across the back of the trailer. I added a treasured quilt, made by my husband's grandmother as the bolster cover, which confines the bedding well and adds some great color. The bolster also works great for leaning back and reading on a rainy day
We may want thicker foam when we take longer trips, but for now, this has been comfortable, functional and easy!