I converted this 7x14 enclosed cargo trailer into a camper. The build took me about four months. The conversion cost a total of $5000, roughly. I saved a lot of money by using construction lumber. Primarily super cheap 1x4s. The trailer has a 100AH lithium battery and 100W solar panel. All lights, fans, electric cooler, and running water can be run off the battery. In theory, I never have to charge the battery because the solar panel. I also have a 2000W inverter and induction cook top. For heating and cooling I'm using a portable AC unit with a heat pump.

Below are other videos I've made for parts of the trailer:
Pocket Door:    • Making a Raised Six Panel Door with a...  
Dinette Seats:    • DIY Dinette Seats for Cargo Camper, R...  
Dinette Seat Cushions:    • The Woodworker's Method of Making Cus...  
Dinette Table:    • Butcher Block Dinette Table | DIY But...  
Long Dinette Cabinet:    • Long Skinny Upper Cabinet for Camper ...  
Tongue and Groove Planks:    • Save Money! Make Your own Tongue and ...  
Headboard:    • DIY Cushion Headboard with Lights and...  
Suitcase Storage Cabinet:    • Unconventional Suitcase Cabinet for m...  
Kitchenette Countertop:    • DIY Construction Lumber Butcher Block...  
Drawer Boxes:    • Easiest Way to Make DIY Drawer Boxes ...  
Breathable Cabinet Doors:    • Easy DIY Slat Cabinet Doors #cargocamper  

Component List (Amazon links are affiliate links which I may earn a commission from if items are purchased, however, they are not sponsored products)::
Electrical:
Solar Kit: https://amzn.to/3OVKF2D
100AH battery: https://amzn.to/3SUP1bF
Inverter: https://amzn.to/3uQ4Qs4
Light switch: https://amzn.to/430tjrw
14 gauge marine wire: https://amzn.to/3SZwcnT
Fuse box: https://amzn.to/3SVsR9k
30amp breaker: https://amzn.to/49ykqHR

Kitchen:
Cooler: https://amzn.to/3TgQ72X
Portable AC with heat: https://amzn.to/42U2hSz
Faucet: https://amzn.to/48B2onl
Induction cooktop: https://amzn.to/3SV1lIP
Kettle: https://amzn.to/3UUQWzy

Bathroom:
Porta potti: https://amzn.to/42U2eGn
Porta potti floor mounting plate: https://amzn.to/3V06jGW
Maxxfan bathroom exhaust fan: https://amzn.to/3IiT3po

Bedroom:
Maxxfan: https://amzn.to/49TQ2Yy
USB Charging ports: https://amzn.to/48Cjdho

Water:
16 gallon water tank: https://amzn.to/3wIfEJh
10 gallon water tank: https://amzn.to/48DTkOi
Water pump: https://amzn.to/3IdyevA

Windows:
Escape window: https://amzn.to/3OXjKUg
Entry door window: https://amzn.to/3wJqNJO
Small window: https://amzn.to/49RtWph
Window blinds: https://amzn.to/49Tk26A

Lighting:
Dome lights: https://amzn.to/3OZlIn4
Courtesy lights: https://amzn.to/49tLS9Z
Puck lights: https://amzn.to/4bS43aO
Outside light: https://amzn.to/4bVBRUl
Reading lights: https://amzn.to/3TjLTrq

Website: https://www.fangerwoodworking.com/

Tool links (Amazon links are affiliate links which I may earn a commission from if items are purchased, however, they are not sponsored products):
Safety Gear
Micro jig narrow rip push block: https://amzn.to/3Nl97ZF
Micro jig paddle push block: https://amzn.to/43Ic9ON
Milescraft push stick: https://amzn.to/3NDlDoW
ISOTunes ear protection: https://amzn.to/44aYpMd
Measuring
FastCap measuring tape: https://amzn.to/3qYM9Ao
Setup blocks: https://amzn.to/3NFobCZ
Sanding
Bosch sander: https://amzn.to/3qVilEE
Saws
Bosch job site table saw: https://amzn.to/46t1nhl
Bosch track saw: https://amzn.to/43RNS8T
Joining
wen biscuit joiner: https://amzn.to/3CGt8Fm
Drilling
Forstner Bit Set: https://amzn.to/3NGbMi8
Other
auto vacuum switch: https://amzn.to/42SayEE
2P10 super glue and activator: https://amzn.to/3Pot7gU
Bosch dust extractor: https://amzn.to/3PmF8Dk
WEN air cleaner: https://amzn.to/3JoWj3B
HDPE miter bars: https://amzn.to/3LvXDma
Toggle clamps: https://amzn.to/3LteTbN