We travel in a 36' class A with 2 sewing machines and an embroidery machine. One stores in a back closet, one under the dinette and one in front of the passenger seat up under the dashboard. We use 2 Walmart folding tables to set up the machine & cutting/pressing stations. For pressing we cut down an old ironing board cover to about 20"x28", backed it with fabric & slipped a piece of cardboard between the two layers. The caddy for my iron opens flat to add a second layer of pressing surface.
If we are each using machines on the folding tables, the cutting & pressing station goes on the stovetop. We have 16 shoebox sized bins for smaller cuts of fabric that store in cabinets above the windshield. The sofa was removed & replaced by a 33"x66"x18" box with a lid, topped by a mattress & bolsters to form a daybed with storage for batting, projects & larger cuts of fabric. I have to confess that there are quilt books, magazines, patterns & supplies tucked in other areas as well.
My husband is also active in amateur radio. His radios are mounted to a plywood box that sits beside him on the dinette bench. Antenna wires come up under the bench thru the floor of the slide. Some equipment is on a shelf under the table between the benches against the wall. The embroidery machine and a pantry box are under the shelf.
We have replaced the dinette table with a desktop from Ikea. It is attached to the wall with L-brackets & has a single folding leg recycled from the original table. The Ikea desktop is the same size as the old tabletop, but is a 4" deep box with a hinged top. His laptop, journal, directories & a pinboard all fit inside when the top is closed, leaving a clear tabletop for meals. Wonderful! No more clearing clutter to make room for dinner. What a joy.