I yanked our "extra" chair and put a computer desk with doors in that spot. It covers the window and fits almost snug up under the cabinets above it.
The seatbelts screw to the floor there and he used those bolts to secure the cabinet as well as secured it to the wall. It doesn't budge. Been there over five years. We full time.
When it is time to roll the wheels, I put all my stuff in there and pile bags of plastic bags and/or a pillow in front of the computer screen, close the doors and off we go.
Just secure the door handles with a wrap-a-round bunge cord so they stay closed.
this one is similar to mine...
clicky http://djfredi.com/small-computer-desk-with-doors/
Kathy