Winter boondock... Cold cab over. Need ideas.

The first thing that comes to mind is reflectix but with such a large window you may need more than that. Removable plexiglass storm windows that can be fastened on the inside are used by some but would be very difficult if not impossible to fit on your curved window. I can't tell if the front window is flat other than the wrap-around curves. If so you might be able to use coroplast. This is the white double-wall plastic stuff that is used for temporary advertising signs. You can get it at home improvement stores, cut it to size, then seal the edges with tape. You'd probably have to piece several pieces together and can affix it with painters tape. One advantage of this is this material is that it lets the light through. If your window bubbles out the only thing I can think to suggest is getting a hot water heater blanket insulation of suitable size, cut it to fit, tape the edges, then tape it in place.