Up until very recently I had been doing all my camping / road trips in an F150 with a DIY wooden shell on the back, with wiring & conveniences inspired by the TTT idea. Last summer I really got it tricked out with a backup camera, racks to quickly rig & unrig awnings, but then went on no camping trips at all due to the gas prices.
I am currently rigging a 2012 Hyundai Elantra as a mini-me version of TTT. Long story about how I came to do that, will post it if anyone is interested.

What I have done:
- Given up the idea of more than one passenger, which very rarely happens to me anyway
- Removed and put into long term storage the rear seat and headrests
- Fashioned a 1/2" plywood shelf to create a flat surface from front floor edge of the trunk to the back of the front seats - 6 feet 8 inches of space, almost 4 feet wide. I paid extra to get a full-size spare tire, which is completely concealed under the trunk floor.
- Added a dedicated always-hot 12VDC line direct from the battery to the rear space for whatever I need, currently a 400W inverter, 2M ham radio and quad 12VDC outlets.
- Salvaged a memory foam topper to create a 6' long 2' wide 3" thick base mattress beneath a 3" thick latex mattress -- feels pretty comfortable
- Bought an extra large reflectix-type sun shade for the back window in addition to a regular one for the front
- The rear window shelf is large & can temporarily hold many items while I sleep.
- Fashioning some flexible mosquito screens for the side windows for ventilation
Still figuring out how to best screen the windows for privacy. The mattress makes it a much quieter vehicle. I carry a small tent for times when it enhances the trip. As it is, I'm good to go for test runs. I figure I will learn other considerations as I use the thing.
It would be possible to sleep 2 side by side, but the Elantra's interior is constricted a bit between the trunk and passenger space. Nearly all luggage would have to be put in the front seats in order to sleep in back. I have space for luggage & a small ice chest.
The mattress installed is 6 feet long and 2 feet wide. The perspective looking through the open trunk or rear doors makes it look smaller than it is.
