After decades of conversions of busses, semi-trucks and trailers, we decided on something different.
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2003, we converted a 1997 Ford CF8000 commercial truck to our concept of an ExpeditionVehicle.
Our conversion took less than a week... while selling everything.
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We decided on bed forward, door aft.
Our interior is three paces across by seven paces long.
This is perfect for two adults -- plus a frequent yummy third -- and two RedHeelers.
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Kitchen:
We are rarely inside, we prefer cooking outside.
Instead of a dedicated 'kitchen' used only a few minutes a day, we use induction hot-plates.
We can cook on our porch, or an extension-cord gets us to a picnic-table.
With two hot-plates, a pair of cooks have elbow-room to craft masterpieces simultaneously.
After cooking, the equipment stores back in their cubbies.
Modular.
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Although we could cook inside, this portable system reduces indoor odor and moisture.
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For worshing, we use retired five-gallon stainless-steel Pepsi kegs.
Modular.
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We can take a half-dozen for a weekend, or a couple-three dozen for an extended remote stay.
Modular.
A quick puff from a 12vdc air-pump for bicycle-tires, and the five-gallons is ready to use.
Our output is a sprayer for a kitchen-sink.
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For hot water, we use kitchen 'sous vide' circulation heaters.
A shower uses three-gallons.
A brainiac calculated the photovoltaic to heat a dedicated three-gallon 'Torpedo' Pepsi-keg knock-off at about ten minutes noonish.
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Living room:
Instead of a couch or pair of recliners -- similar to a stand-still house - we realized our RequirementsStatement put us outside most of the time.
I could say 'this beach is my living-room' or 'this forest... or 'this desert...'.
Modular.
I hope this makes sense.
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Nearly two decades full-time live-aboard in this rig, we are pretty sure 'SIMPLER IS BETTER'.
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For portraits of parts of our ExpeditionVehicle, toy-hauler I built on a commercial chassis, and our 40' semi trailer conversion, gander at these:
https://eugene.craigslist.org/pts/d/...374463500.html
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PS:
Moments prior to reading your post, I visualized a bus.
Plating over the front entry.
Extending the floor to fill over the former entry steps.
Mount a navigator seat to match the operator seat.
Wall behind the drive area.
Forward bed as part of that wall.
Aft door(s).
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Great minds...