How much weight could be eliminated?

LOL! You just described our first pop-up camper!! I bought it used for $1000. The lady who owned it ahead of me had no clue what worked/didn't work, so I assumed nothing worked. The gas line had already been cut, so I yanked anything using propane, (including the fridge which didn't appear to work on electric, either). I pulled the disgusting freshwater tank; and the dead battery. Amazingly, yanking a lot of the stuff that didn't work gave me freed-up storage areas! Since we normally camp where we have an electric hookup, I cooked with an electric hotplate and if we needed heat, we had an electric heater. Water was supplied from a 2.5 gal jug. If we had planned to keep it longer, I would have added a Fantastic Fan; but if you point a tabletop fan upward at an opened vent, it works quite well, too. It really worked just fine!