Thank you guys for all replies and suggestions. I guess by doing so we all keep learning.
I've been camping quite a lot in the past. I have gone to many remote places but most of the time it was by my regular car, hiking or on my inflatable boat. Also have tested lots of different options and hear related to ultralight camping. I have never however owned a camper and that this is s part new to me. With the limited budget I can only do what I can. Van is not an option because I will not drive around with all gear while I'm settled in some area for few months. Yes possibly I could use a bike but I also eventually consider a small scooter, motor bike etc (or course this would require bigger rig).
I consider several setup combinations and options and of course all of them will be some kind of trade offs. Having said that here are some features and trade offs I see in my setup. This will be one person setup only (unless I find a girlfriend to join me - haha).
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1. 200W solar panel
2. Light bicycle
3. No microwave
4. No TV
5. Front grill where I can mount my bike (for better weight balance). If not bike then I could perhaps put some other heavier item.
6. Extra batteries sitting in a cab (I only consider Extended cab truck, no other options)
7. Air bags (of course)
8. Possibly extra sway bars for better stability
9. Small aluminum roof rack (for extra temporary storage)
10. Ladder or some kind of roof access
11. Must have storage to small inflatable kayak etc.
12. I must be able to leave the camper and drive around so options are: A-use truck B-use scooter C- use bike, electric bike etc
13. I must be self sustained for longer period of time (i.e 1+ month) without shopping for food. I consider small food dehydrator. Will also probably install extra solar freezer.
14. Space for power generator (optional)
15. I'm buying Water Filter and Water Distiller so would not have to carry drinking water (or just minimal amount).
Now the question to all of you. Does anybody know of any place I could buy a camper frame/shell without any internal finish, so I can do interior myself. God example here would be a Livin Lite camper, which is 100% aluminum, although wooden frames would be OK as well. My idea is to get a plain frame-shell and build it precisely to my needs with ultralight materials. When I look i.e at Travel Lite campers, they are light but I could easily shave off 20% of weight by removing stuff I do not need. For example why would I use such a big bed for 1 person ? Why would I carry TV, Micro if I don't want it. Also the cabinets are made of a heavy material (wood has never been light although easy to build).
If I would be a little younger I would probably start a business selling camper building kits so everyone can build camper from blocks and suit more precisely to the needs. Quality of Travel Lite campers is also rather poor (but they give what we pay for so I did not expect to much for $13.000).
I recently bought Mr.Heater on demand shower so this could possibly solve the shower options. I also have ultralight shower tent which folds out in 30sec. The problem is that if I go farther north (in fall or even a winder for few weeks) and need to use it while there is 30 deg or less outside it will not be really much fun. For the last 20 years of traveling shower was always my biggest concern. I have 4 portable showers (from pocket one to Zodi heated container) but all of them will not really work in a cold weather. I was considering setting up my portable shower tent then using Mr.Heater (heater) to warm up the inside and use Mr.Heater On-Demand shower, but not sure how this would work (probably until I try such setup). Toilet is not an issue for me at all I am not concern abut this part at all. I definitely prefer to have an indoor shower over the toilet.
As far as cars. I switched 1 1/2 yr ago from Toyota Yaris to Subaru Forester. My Yaris was barely smelling the gas (with 35 MPG). Forester is OK (with 23 MPG) but going down to 12 mpg ? Not sure if I would like to spend so much, especially I don't think I would be sitting in one place for 6+ months like many folks do.
I definitely cannot afford to buy new equipment. I am aiming for a camper no older then 5 years (preferably 1-2) and a truck in a price range of $10-15 grand. I have seen on line that some ofr the F150's can have about 2700LB payload. Here
are the specs for a new one
So as far as fuel 16-18 mpg is for me acceptable but 12 mpg is rather not (unless I'm sharing cos with somebody).
Perhaps it could be a god idea to start some kind of open project and create plans for DIY camper where people could do multiple designs based on the same frame. Finding a manufacturer of such frames should not be so hard. I'm planning to check with Travel Lite and Living Late if they have any unfurnished options of those campers available. Perhaps another option would be to buy older used camper, take it apart and completely remodel it but I'm not sure if this would be money efficient (making much savings).