If you bought the trailer from the previous owner and you did not receive the manuals for the installed appliances you should take a few hours and look for the appliances. On the appliances there will be a tag of some sort stating the manufacturer name and model number. Write that info down and look them up on the internet. Some manuals can be found on this forum in the Library section. The sizes and number of the documents will be too large to store on a smart phone unless you save them to your cloud storage. Storing the files on a laptop will be the best way because you'll have access to the files when you don't have internet access. The next best is a tablet that you can connect to a thumb drive.
To give you an example, I have a laptop that has 1.46 gigabytes in 543 files just for my TT. I leave the original documents in the TT and use the laptop to access the files at home. Also, the laptop goes with me to the camper every time I go.
Richard & Jill
2014 Flagstaff 832IKBS Classic Super Lite
2018 Silverado 1500 Crew Cab Z71 4WD All Star Edition
Camping since 1989, seasonal since 2000
Car Shredder Op/Tech, Scrap Metal Recycling - retired
The Faster I Go, The Behinder I Get.