Boating folks come up with some unique solutions:To throw another angle into the mix. You may want to think hard about the bathroom. I have a teardrop and never had one and we haven't really haven't missed it. We have a privacy shelter with a boat toilet when necessary. If we camp at a site we use facilities for shower and restroom. If we are boondocking we just use the river/stream/lake with Dr Bronners soap. The less weight, expense and maintenence is well worth it.
My neighbor and another friend just sold their bathroom equipped RV and went with a Hiker Trail and added a rooftop tent for the kids. Their weight fully loaded for a week comes in at 2400 pounds and only a 1-2 mpg loss. They haven't looked back. Granted teardrop rving is more a step up from camping than rving. Not for everyone.
https://www.hikertrailers.com/
https://duckworks.com/mud-dog-travel-shower/
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