How much weight could be eliminated?

I think your making a mistake trying to eliminate the propane system. keep the stove fridge and furnace and tanks, they dont add up to much but they are the most convenient way to do things with out having to plug in. I guess you could look at using a diesel espar type heater, dont know about the weight savings but it would be a litle more efficent power wise. going to lithium batteries would be your biggest single shot weight reduction I would think. is there a certian amount of weight you need to lose, you could also make sure your utility trailer is loaded so only 10% of the total weight is on the hitch to minimize what your putting on the truck..

Steve