Have a look at Ionic batteries: https://lithiumhub.com/lithium-deep-cycle-batteries/rv-batteries/ They have built in Bluetooth along with an app that gives you all kinds of info. Output, input, amps, volts, etc. Love mine.
Don't know what CPAP you have but here is an excellent resource for battery requirements for Resmed CPAP units.
https://www.resmed.com/us/dam/documents/articles/198103_battery-guide_glo_eng.pdf
Look into Ionic batteries:
https://lithiumhub.com/product/12-volt-125ah-battery/#reviews
I have the 125Ah 12v and it's great. Even has bluetooth which connects to app on phone which gives all kinds of info on battery. Believe it's available for android or IOS.
There's a Facebook page for MTs. Might be of some help.
https://www.facebook.com/Mobile-Traveler-Owners-Group-103407506403462/
I've got a 1983 18.5' one (Chevy).
Free Soylent? That's cool. Throat cancer, not so much. I've been about 95% Soylent since 2015. Try adding Mio water enhancer. The orange/vanilla makes Soylent taste like a melted creamsicle (50/50 bar).
Ever considered Soylent, Huel, or other meal replacements? I use the "ready to drink" bottles, but they also have powder. Most are vegan, some pro GMO, some not.
Check out these pix. Will help a little maybe. I own a 1983 18.5 foot Mobile traveler.
https://www.jimscamperservice.com/check-out-our-project--mobile-traveler
These are hard to find but very well put together:
http://www.ebay.com/itm/1999-STARFLYTE-CLASS-B-21FT-RV-CAMPER-REAR-BED-GENERATOR-BATH-GREAT-MPG-CLEAN-/172438304607?forcerrptr=true&hash=item28261fb75f:g:tvkAAOSwEzxYSfaS&item=172438304607
I've been using it for 90% of my meals for 2 months. I use the newest version 1.4. I've had no problems so far. It's fast, convenient and saves a lot of money ! I think the naysayers have not researched it enough.