Why I didn't replace the threeway with a compressor refrigerator - a 5 gallon tank of gas can keep a refrigerator cool for literally weeks while also cooking with gas. Electricity is the most stressed commodity in the camper (along with water, only 13 gallons in a 1993). The draw of a refrigerator compressor refrigerator means generating electricity by solar, generator, or driving virtually every day. Even then, it takes much longer than you think to recharge batteries.
Why not a new camper? I'm kinda stubborn and like the old one just fine. We've developed our ways of living in this small space winter, spring, summer, and fall. I'd rather repair almost anything than just buy a new one.
That said, there are some real advances in the newer FWCs.
First and foremost, they've doubled the matress thickness. 2" inches was like sleeping on a concrete slab even 22 years younger. We solved the problem by purchasing two 2" Thermorest "Camprest" matresses that make the overhead bed acceptably comfortable and quite warm in the cold.
FWC increased the water capacity from 13 gallons to 23. We can go 3 - 4 days without water unless we shlep around a couple of 5 gallon containers of water.
The rest of the stuff like water heaters and wasting space on showers and toilets is a non-starter for me. The space is small anyway and is needed for simply living in it. Two people need two places to lie and read comfortably and we need two places for watching dvds. That just doesn't happen in a small camper crammed with too many amenities.
Also, the size limits on files here makes uploading meaningful pictures of my modifications to my camper pretty much impossible.
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